A man holds a giant pencil as he takes part in a Hundreds of thousands of French citizens solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. REUTERS/Stephane Mahe (FRANCE - Tags: CRIME LAW POLITICS CIVIL UNREST SOCIETY TPX IMAGES OF THE DAY) 

Israel's Prime Minister Benjamin Netanyahu (L), Mali's President Ibrahim Boubacar Keita (2ndL), French President Francois Hollande (C), Germany's Chancellor Angela Merke (4thL), European Council President Donald Tusk (5thL) and Palestinian President Mahmoud Abbas attend the solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. REUTERS/Philippe Wojazer (FRANCE - Tags: CRIME LAW POLITICS CIVIL UNREST SOCIETY TPX IMAGES OF THE DAY) 

French columnist for Charlie Hebdo Patrick Pelloux (R) and cartoonist Luz (L) take part with family members and relatives of the seventeen victims in a solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. Hundreds of thousands of French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims, including journalists and policemen, following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. REUTERS/Yves Herman (FRANCE - Tags: CRIME LAW POLITICS CIVIL UNREST SOCIETY TPX IMAGES OF THE DAY)

Pallbearers carry the coffin of late satirical French magazine Charlie Hebdo cartoonist Bernard Verlhac, known as Tignous, after a tribute at the Montreuil town hall, near Paris, January 15, 2015. Ceremonies continue to honour the memories of the 17 people who were killed in last week's attacks. REUTERS/Gonzalo Fuentes (FRANCE - Tags: POLITICS CRIME LAW MEDIA TPX IMAGES OF THE DAY) 

A general view shows hundreds of thousands of French citizens taking part in a solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. REUTERS/Eric Gaillard (FRANCE - Tags: CRIME LAW POLITICS CIVIL UNREST SOCIETY)

French President Francois Hollande bows his head in front of the coffin of late police officer Frank Brinsolaro during a national tribute at the Paris Prefecture for the three police officers killed during last week's attacks by Islamic militants, January 13, 2015. The three police officers were killed in the attacks at the offices of satirical weekly Charlie Hebdo and in the streets of Montrouge, outside the French capital. REUTERS/Francois Mori/Pool (FRANCE - Tags: POLITICS CRIME LAW) 

People hold panels to create 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 January 11, 2015. French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. REUTERS/Charles Platiau (FRANCE - Tags: CRIME LAW POLITICS CIVIL UNREST SOCIETY) 

French President Francois Hollande (L) welcomes Germany's Chancellor Angela Merkel as she arrives at the Elysee Palace before the solidarity march (Rassemblement Republicain) in the streets of Paris January 11, 2015. French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. REUTERS/Pascal Rossignol (FRANCE - Tags: CRIME LAW POLITICS CIVIL UNREST SOCIETY TPX IMAGES OF THE DAY)

A woman holds a placard that reads, "I am Charlie", during a vigil to pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, at Trafalgar Square in London January 7, 2015. Hooded gunmen stormed the Paris offices of the weekly satirical magazine known for lampooning Islam and other religions, shooting dead at least 12 people, including two police officers, in the worst militant attack on French soil in decades. REUTERS/Stefan Wermuth (BRITAIN - Tags: POLITICS CRIME LAW CIVIL UNREST TPX IMAGES OF THE DAY) 

The message "Paris is Charlie" is projected on the Arc de Triomphe in Paris January 9, 2015, in tribute to the victims following Wednesday's deadly attack at the Paris offices of weekly satirical newspaper Charlie Hebdo by two masked gunmen who shouted Islamist slogans. REUTERS/Youssef Boudlal (FRANCE - Tags: CRIME LAW MEDIA) 

Satirical French magazine Charlie Hebdo new editor in chief Gerard Briard (L) and columnist Patrick Pelloux comfort cartoonist Luz (C) during a news conference at the French newspaper Liberation offices in Paris, January 13, 2015. Charlie Hebdo will publish the front page showing a caricature of the Prophet Mohammad holding a sign saying "Je suis Charlie" in its first edition since Islamist gunmen attacked the satirical newspaper. With demand surging for the edition due on Wednesday, the weekly planned to print up to 3 million copies and in sixteen languages, dwarfing its usual run of 60,000, after newsagents reported that large numbers of customers around the country were placing orders. REUTERS/Philippe Wojazer (FRANCE - Tags: POLITICS MEDIA) 

The message "We are all Charlie" is seen on the facade of the Arab World Institute (IMA) in Paris January 14, 2015, in tribute to the victims of the attack at the Paris offices of French weekly satirical newspaper Charlie Hebdo and kosher supermarket Hyper Cacher. REUTERS/Youssef Boudlal (FRANCE - Tags: MEDIA CRIME LAW SOCIETY) 

A boy looks on as a supporter of a religious group holds a sign which reads "Mohammad", during a protest against against satirical French weekly newspaper Charlie Hebdo, which featured a cartoon of the Prophet Mohammad as the cover of its first edition since an attack by Islamist gunmen, in Lahore January 23, 2015. REUTERS/Mohsin Raza (PAKISTAN - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY RELIGION MEDIA) 

Amandine Marbach from Strasbourg, France, takes part in a vigil to pay tribute to the victims of a shooting, by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, in the Manhattan borough of New York January 7, 2015. Hooded gunmen stormed the Paris offices of the weekly satirical magazine known for lampooning Islam and other religions, shooting dead at least 12 people, including two police officers, in the worst militant attack on French soil in decades. Sign reads "I am Charlie". REUTERS/Carlo Allegri (UNITED STATES - Tags: CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY) 

Placards which read "I am Charlie" are placed on the desks of Members of the European Parliament in Strasbourg, January 12, 2015, during a debate on last week shootings by gunmen in Paris at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. REUTERS/Vincent Kessler (FRANCE - Tags: CRIME LAW MEDIA POLITICS)