Iran's national flags are seen on a square in Tehran February 10, 2012, a day before the anniversary of the Islamic Revolution. REUTERS/Morteza Nikoubazl

Men carry children away from a damaged site after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail

2016 Rio Olympics - Swimming - Preliminary - Women's 100m Freestyle - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 10/08/2016. Yusra Mardini (SYR) of Refugee Olympic Athletes competes. REUTERS/Dominic Ebenbichler

A man carries an injured girl after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail

A man reacts while being carried on a stretcher after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail

A man carries an injured child after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail

A man runs with a stretcher in a damaged site after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail

People inspect a damaged site after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail