U.S. Secret Service agents stand on the debate floor before the first presidential debate at Hofstra University in Hempstead, New York, U.S., September 26, 2016. REUTERS/Lucas Jackson

Students at the Durban University of Technology march as countrywide protests demanding free tertiary education continue, in Durban, South Africa, September 26, 2016. REUTERS/Rogan Ward TPX IMAGES OF THE DAY

A Palestinian boy stands between militants of the Popular Resistance Committees during a military parade in Rafah in the southern Gaza Strip September 26, 2016. REUTERS/Suhaib Salem TPX IMAGES OF THE DAY

One of the warning leaflets dropped by the Syrian army is seen in the rebel held Tariq al-Bab neighbourhood of Aleppo, Syria September 25, 2016. The leaflet reads (top) "This is your destiny!!!" and (bottom L) " who is next" as it depicts pictures of killed rebel commanders and fighters. REUTERS/Abdalrhman Ismail

A man walks on the rubble of damaged buildings after an airstrike on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 25, 2016. REUTERS/Abdalrhman Ismail TPX IMAGES OF THE DAY

A member of the New York City police stands guard before the start of the annual Muslim Day Parade in the Manhattan borough of New York City, September 25, 2016. REUTERS/Stephanie Keith TPX IMAGES OF THE DAY

U.S. President Barack Obama and U.S. First Lady Michelle Obama along with four generations of the Bonner family ring the bell of the First Baptist Church during the dedication of the Smithsonian’s National Museum of African American History and Culture in Washington, U.S., September 24, 2016. REUTERS/Joshua Roberts 

Britain's Catherine, Duchess of Cambridge holds the hand of her son Prince George while carrying Princess Charlotte as Prince William (L) speaks with officials as they arrive at the Victoria International Airport for the start of their eight day royal tour to Canada in Victoria, British Columbia, Canada, September 24, 2016. REUTERS/Chris Wattie TPX IMAGES OF THE DAY 

People gather outside the football stadium as the NFL's Carolina Panthers host the Minnesota Vikings, to protest the police shooting of Keith Scott, in Charlotte, North Carolina, U.S., September 25, 2016. REUTERS/Mike Blake TPX IMAGES OF THE DAY

Israel's Prime Minister Benjamin Netanyahu departs after meeting with Republican presidential nominee Donald Trump at Trump Tower in New York, U.S. September 25, 2016. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY

Britain's Prince William (R), and Catherine (2nd R), Duchess of Cambridge, pose for a photo with Canada's Prime Minister Justin Trudeau (2nd L) and his wife Sophie Gregoire Trudeau at the start of a meeting in Victoria, British Columbia, Canada, September 24, 2016. REUTERS/Chris Wattie TPX IMAGES OF THE DAY

Aerial Emery trains on the cyr wheel at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY

Smoke rises behind the ancient castle of the rebel-controlled town of Maaret al-Numan after airstrikes in Idlib province, Syria, September 25, 2016. REUTERS/Khalil Ashawi TPX IMAGES OF THE DAY

A woman looks out from a door during a protest in Srinagar, against the recent killings in Kashmir region, September 25, 2016. REUTERS/Danish Ismail TPX IMAGES OF THE DAY

Children stand in front of the bullet-riddled facade of a building in the rebel-held Douma neighbourhood of Damascus, Syria September 25, 2016. REUTERS/Bassam Khabieh TPX IMAGES OF THE DAY

A dog wipes out during the Surf City Surf Dog competition in Huntington Beach, California, U.S., September 25, 2016. REUTERS/Lucy Nicholson TPX IMAGES OF THE DAY

Visitors ride a roller coaster during the 183rd Oktoberfest in Munich September 25, 2016. Millions of beer drinkers from around the world will come to the Bavarian capital for the Oktoberfest, which runs until October 3, 2016. REUTERS/Michael Dalder TPX IMAGES OF THE DAY

Women dressed in traditional attire pose after taking part in rehearsals for Garba, a folk dance, ahead of Navratri, a festival when devotees worship the Hindu goddess Durga, in Ahmedabad, India, September 25, 2016. REUTERS/Amit Dave 

U.S. First Lady Michelle Obama hugs former U.S. President George W. Bush as she arrives with U.S. President Barack Obama and former first lady Laura Bush for the dedication of the Smithsonian’s National Museum of African American History and Culture in Washington, U.S., September 24, 2016. REUTERS/Joshua Roberts TPX IMAGES OF THE DAY

An artisan hangs decorative pieces at a pandal, or a temporary platform, for the upcoming Hindu festival of Durga Puja, in Kolkata, India, September 25, 2016. REUTERS/Rupak De Chowdhuri TPX IMAGES OF THE DAY