A picture taken on April 4, 2017 shows destruction at a hospital room in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, following a suspected toxic gas attack. Dozens of civilians were killed including several children, a monitor said, with the opposition accusing the government and demanding a UN investigation. Photo credit: Getty Images
A woman lays flowers in honour of the victims of the April 3, 2017 blast in the Saint Petersburg metro at a memorial stone in central Moscow. The death toll from the bombing on the metro train rose to 14 as Kyrgyzstan said a suicide bomber from the Central Asian country had staged the attack. Photo credit: Getty Images
Children look out from a tent in Iraq's Hamam al-Alil refugee camp on April 5, 2017. Around 300,000 people in Iraq's second largest city of Mosul have left their homes as the fighting to retake the city from ISIL enters its sixth month. Photo credit: Getty Images
Theresa May, U.K. Prime Minister receives a medal from King Salman bin Abdulaziz, Saudi Arabia's King during their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia, on April 5, 2017. May plans to help Saudi Arabia lower its dependency on oil exports and increase the participation of women in the workforce as the Gulf kingdom seeks to modernise its economy. Photo credit: Getty Images
View of houses on a hill painted with vivid colours in Pachuca, Hidalgo, Mexico on April 4, 2017. The initiative, promoted by the Crime Prevention Secretariat, seeks to motivate young people from the pressures of violence to participate and paint murals in their communities. Photo credit: Getty Images