At least 18 people died during an attack in a technical college on the Crimean Peninsula.
Video showed terrified students running and screaming during the attack on Kerch Polytechnic College which is near a new bridge connecting the region to Russian Federation.
"The initial inspection of the bodies suggests that they died from gunshot wounds", Russia's investigative committee said in a statement. A security camera image carried by Russian media showed him calmly walking down the stairs of the school in the Black Sea city of Kerch, the shotgun in his gloved hand.
The Telegram channel 112 identified the man as Vladislav Roslyakov, an 18-year-old fourth-year student of the polytechnic college.
The attack had first been reported as an explosion and the Russia's National Anti-Terrorism Committee said an "unidentified explosive device" had gone off in the canteen.
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Putin deplored the attack as a "tragic event" and offered condolences to the victims' families at a news conference in Sochi, where he had talks with Egyptian President Abdel-Fattah el-Sissi.
It was not immediately clear whether the casualties were from gunshots or the blast.
A source in the emergency services told RIA Novosti state news agency that Roslyakov had legally acquired a gun licence. Grebennikova, who said she had left the grounds shortly before the attack occurred, said students and staff were among victims.
"Civilians can own only hunting rifles and smooth-bore shotguns and must undergo significant background checks", AP points out.
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Kerch is the landing point and namesake of a bridge that opened earlier this year to connect Crimea to Russian Federation. Russia's Defence Minister Sergei Shoigu said the military was sending forces and supplies to help the victims.
Authorities said they are investigating whether Roslyakov had accomplices or whether he was acting "under the influence" of another person or group.
A gunman burst into a college in the Black Sea region of Crimea, set off a bomb in the cafeteria, and went through the building shooting, officials and the college's director said. Gavrilov said he looked out and saw a young man with a rifle firing at people.
It also said that the suspect shot himself and his body had been found inside the college.
Russian Federation annexed Crimea from Ukraine in 2014, prompting global condemnation and Western sanctions, but since then there have been no major outbreaks of violence on the peninsula.
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