At least 17 people were killed and about 50 injured following a bombing in Russian-annexed Crimea, according to Russia.
Officials initially said an “unidentified explosive device” detonated, but now say all the victims died of gunshot wounds at the technical college in city of Kerch.
The committee said CCTV footage showed 18-year-old student Vladislav Roslyakov entering Kerch Polytechnic College with a rifle on Wednesday and firing at students.
Anastasia Yenshina, a 15-year-old student at the college, said she was in a toilet on the ground floor of the building with some friends when she heard the sound of an explosion.
“I came out and there was dust and smoke, I couldn’t understand, I’d been deafened,” she told Reuters.
Russia annexed Crimea from Ukraine in 2014, prompting international condemnation and Western sanctions.
Russian President Vladimir Putin, at a meeting in the southern Russian resort of Sochi with his Egyptian counterpart, declared a moment’s silence for the victims.
“This is clearly a crime,” he said. “The motives will be carefully investigated.”
Troops with armoured personnel carriers were sent to the scene, military units were deployed around the college and local parents were told to collect their children from the city’s schools and kindergartens for their safety.
Sergei Melikov, a deputy chief of the Russian National Guard, said the explosive device was homemade. Explosives experts were inspecting the college building for other possible bombs, according to Anti-Terrorism Committee spokesman Andrei Przhezdomsky.