At least 17 people were killed and dozens more wounded, most of them teenagers, after an attack on a college in Russian-annexed Crimea on Wednesday, with conflicting versions referring to a lone shooter and a bomb.

Russia's Investigative Committee said the attack was carried out by student Vladislav Roslyakov, 18, who was captured on security camera footage carrying a gun in the technical college in Kerch and whose body was later found with gunshot wounds. The Investigative Committee said all victims died of gunshot wounds.