At least 17 people have been killed and 40 wounded after a student gunman attacked a university in Crimea, Russian officials say. The story is the latest in a series of shifting explanations for the deaths Wednesday in the city of Kerch: Officials at first reported a gas explosion, then said an explosive device ripped through the college canteen in a suspected terror attack. Sergei Aksyonov, the regional leader in Crimea, now says a local student acting alone fired a rifle at students before killing himself. The Investigative Committee identified the attacker as Vladislav Roslyakov, 18, and said all victims died of gunshot wounds—not an explosion. Earlier, Russia’s Investigative Committee, the nation’s top investigative agency, said a homemade explosive device was detonated. Kerch is an entry point for a new $3 billion bridge linking Crimea to mainland Russia. Russia annexed Crimea from Ukraine in 2014, triggering worldwide condemnation.