French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French CRS riot police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Philippe Wojazer++ EDITORS NOTE THAT FRENCH LAW REQUIRES THAT FACES OF LAW ENFORCEMENT OFFICERS ARE MASKED IN PUBLICATIONS WITHIN FRANCE ++ 

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Philippe Wojazer++ EDITORS NOTE THAT FRENCH LAW REQUIRES THAT FACES OF LAW ENFORCEMENT OFFICERS ARE MASKED IN PUBLICATIONS WITHIN FRANCE ++ 

French police check a pedestrian as they secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Philippe Wojazer++ EDITORS NOTE THAT FRENCH LAW REQUIRES THAT FACES OF LAW ENFORCEMENT OFFICERS ARE MASKED IN PUBLICATIONS WITHIN FRANCE ++ 

French police check a pedestrian as they secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Philippe Wojazer++ EDITORS NOTE THAT FRENCH LAW REQUIRES THAT FACES OF LAW ENFORCEMENT OFFICERS ARE MASKED IN PUBLICATIONS WITHIN FRANCE ++ 

French police check a pedestrian as they secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Philippe Wojazer++ EDITORS NOTE THAT FRENCH LAW REQUIRES THAT FACES OF LAW ENFORCEMENT OFFICERS ARE MASKED IN PUBLICATIONS WITHIN FRANCE ++ 

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French police secure the area after a man was shot dead at a police station in the 18th district in Paris, France January 7, 2016. Police in Paris on Thursday shot dead a knife-wielding man who tried to enter a police station, police union sources said. The incident took place on the anniversary of last year's deadly Islamist militant attacks on the Charlie Hebdo satirical magazine in the French capital. REUTERS/Charles Platiau

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande walks past the French police forces as he attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande (L) attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande (C), French Finance minister Michel Sapin (L), French Justice minister Christiane Taubira (2ndL), French Senate President Gerard Larcher (3rdR), French Prime minister Manuel Valls (4thR), French Interior minister Bernard Cazeneuve (3rdR), French Defence minister Jean-Yves Le Drian (2ndR) and French Agriculture minister Stephane Le Foll (R) attend a ceremony during a visit to the French anti-terror police forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande (C), flanked by French Defence minister Jean-Yves Le Drian (2ndR), leaves after meeting the French anti-terror police forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande walks past the French police forces as he attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande delivers New Year's wishes to anti-terror security forces (Sentinelle) at Paris' police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande attends a ceremony during a visit to the French anti-terror security forces (Sentinelle) at Paris police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

French President Francois Hollande delivers New Year's wishes to anti-terror security forces (Sentinelle) at Paris' police headquarters, one year after the killings at the French satirical newspaper Charlie Hebdo, in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Martin Bureau/Pool 

Women mourn at a memorial to pay tribute to the victims of the last year's January attacks outside the former offices of French weekly satirical newspaper Charlie Hebdo in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau

A woman lights a candle near a memorial to pay tribute to the victims of the last year's January attacks outside the former offices of French weekly satirical newspaper Charlie Hebdo in Paris, France, January 7, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau

Stuffed toys paying tribute to the victims of last year's January and November shooting attacks are placed amongst a frieze on the statue at the Place de la Republique in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau

People look at flowers and messages to pay tribute to the victims of last year's January and November shooting attacks near the statue at the Place de la Republique in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau

Stuffed toys paying tribute to the victims of last year's January and November shooting attacks are placed amongst a frieze on the statue at the Place de la Republique in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau

People look at flowers and messages to pay tribute to the victims of last year's January and November shooting attacks near the statue at the Place de la Republique in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau TPX IMAGES OF THE DAY 

People look at flowers and a commemorative plaque to pay tribute to the victims of the last year's January attacks outside the former offices of French weekly satirical newspaper Charlie Hebdo in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau

The name of cartoonist Wolinski is seen after the spelling was corrected on a commemorative plaque to pay tribute to the victims of the last year's January attacks outside the former offices of French weekly satirical newspaper Charlie Hebdo in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Charles Platiau

Flowers and messages in tribute to the victims of last year's January attacks are seen in front of the Hyper Cacher kosher supermarket at the Porte de Vincennes in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. The slogan reads "We are all Jewish". REUTERS/Charles Platiau

Flowers and messages in tribute to the victims of last year's January attacks are seen in front of the Hyper Cacher kosher supermarket at the Porte de Vincennes in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. The slogan reads "We are all Jewish". REUTERS/Charles Platiau

People look at flowers and messages in tribute to the victims of last year's January attacks in front of the Hyper Cacher kosher supermarket at the Porte de Vincennes in Paris, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. The slogan on the French flag reads "We are all Jewish, we are all Police, we are all Charlie". REUTERS/Charles Platiau

A man reads the latest edition of French weekly newspaper Charlie Hebdo with the title "One year on, The assassin still on the run" on a cafe terrasse in Nice, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Eric Gaillard

A man takes a copy of the latest edition of French weekly newspaper Charlie Hebdo with the title "One year on, The assassin still on the run" displayed at a kiosk in Nice, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Eric Gaillard

A man reads the latest edition of French weekly newspaper Charlie Hebdo with the title "One year on, The assassin still on the run" on a cafe terrasse in Nice, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Eric Gaillard TPX IMAGES OF THE DAY 

A man takes a copy of the latest edition of French weekly newspaper Charlie Hebdo with the title "One year on, The assassin still on the run" displayed at a kiosk in Nice, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Eric Gaillard

A copy of the latest edition of French weekly newspaper Charlie Hebdo with the title "One year on, The assassin still on the run" is displayed at a kiosk in Nice, France, January 6, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Eric Gaillard

People hold panels to create an image depicting the eyes of late Charlie Hebdo editor Stephane Charbonnier, known as "Charb", as hundreds of thousands of French citizens take part in a solidarity march (Marche Republicaine) in the streets of Paris, in this January 11, 2015 file picture. To match FRANCE-SHOOTING/ANNIVERSARY REUTERS/Charles Platiau/Files 

A person holds a placard with a pencil which reads "I am Charlie" during a minute of silence for victims of the shooting at the Paris offices of Charlie Hebdo, in Strasbourg in this January 8, 2015 file picture. To match FRANCE-SHOOTING/ANNIVERSARY REUTERS/Vincent Kessler/Files

A French soldier patrols after French President attended a ceremony to pay tribute to the victims of last year's January attacks outside the Hyper Cacher kosher supermarket in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Ian Langsdon/Pool 

A view of the commemorative plaque unveiled by French President outside the Hyper Cacher kosher supermarket during a ceremony to pay tribute to the victims of last year's January attacks in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Ian Langsdon/Pool 

A view of the commemorative plaque unveiled by French President outside the Hyper Cacher kosher supermarket during a ceremony to pay tribute to the victims of last year's January attacks in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Ian Langsdon/Pool 

French President Francois Hollande (C), French Prime Minister Manuel Valls (L) and Mayor of Paris Anne Hidalgo (R) stand at attention after unveiling a commemorative plaque outside the Hyper Cacher kosher supermarket during a ceremony to pay tribute to the victims of last year's January attacks in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Ian Langsdon/Pool 

A commemorative plaque is seen during a ceremony at the site where policeman Ahmed Merabet was killed during the last year's January attack in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier TPX IMAGES OF THE DAY

French police react after a ceremony to unveil a commemorative plaque at the site where policeman Ahmed Merabet was killed during the last year's January attack in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier 

French police react after a ceremony to unveil a commemorative plaque at the site where policeman Ahmed Merabet was killed during the last year's January attack in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier 

French police and officials react during a ceremony to unveil a commemorative plaque at the site where policeman Ahmed Merabet was killed during the last year's January attack in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier 

The mother of Ahmed Merabet (L), the policeman who was killed during the last year's January attack, leaves after a ceremony to unveil a commemorative plaque at the site where he was shot in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier 

French President Francois Hollande (C) and Paris Mayor Anne Hidalgo unveil a commemorative plaque during a ceremony at the site where policeman Ahmed Merabet was killed during the last year's January attack in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier 

The message "I am Ahmed" is painted on the ground during a ceremony to unveil a commemorative plaque at the site where policeman Ahmed Merabet was killed during the last year's January attack in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier 

French President Francois Hollande (C) speaks with officials during a ceremony to unveil a commemorative plaque at the site where policeman Ahmed Merabet was killed during the last year's January attack in Paris, France, January 5, 2016. France this week commemorates the victims of last year's Islamist militant attacks on satirical weekly Charlie Hebdo and a Jewish supermarket with eulogies, memorial plaques and another cartoon lampooning religion. REUTERS/Benoit Tessier