A Greek riot police officer (front R) stands guard as migrants and refugees wait a registration procedure at the national stadium of the Greek island of Kos, August 12, 2015. Greek police used fire extinguishers and batons against migrants on the island of Kos on Tuesday after violence broke out in a sports stadium where hundreds of people, including young children, were waiting for immigration papers. (Photo by Alkis Konstantinidis/Reuters)
