A crowd of some 300 pro-Russian separatists clash with riot police as they storm the prosecutor's office in the eastern Ukrainian city of Donetsk  on May 1, 2014. The mob hurled rocks and Molotov cocktails at around 100 riot police defending the building, who responded with stun grenades and tear gas, in the latest unrest to hit the crisis-wracked eastern part of Ukraine. AFP PHOTO/ ALEXANDER KHUDOTEPLY        (Photo credit should read Alexander KHUDOTEPLY/AFP/Getty Images)