The scene of an explosion next to a trolleybus stop which claimed at least 8 lives in downtown Donetsk, Ukraine, January 22, 2015. Alexander Ermochenko / Reuters

People look through the front windshield of the damaged trolleybus. The attack took place as Ukraine’s defense ministry said that its troops had left the main terminal of the airport, a focus of intense fighting for the last few months. Alexander Ermochenko / Reuters

The blast at the trolleybus stop severely damaged nearby storefronts. Alexander Ermochenko / Reuters

Ukrainian servicemen battle with pro-Russian separatists in a village near Donetsk, January 21, 2015. Oleksandr Klymenko / Reuters

Emergency workers inspect a railway bridge damaged in an attack that cut off the rail link between Mariupol and western Ukraine, January 21, 2015. Reuters

A local man investigates his home after it was damaged by shelling in a village not far from Mariupol, Monday, January 19, 2014. Sergey Vaganov / EPA

Relatives attend the funeral of an 11-year-old boy who was killed during shelling near Debaltseve, January 19, 2015. Anastasia Vlasova / EPA