At least 18 people were killed, most of them teenagers and about 50 more injured following a bombing in Russian-annexed Crimea, according to Russia.

Russia's National Anti-Terrorism Committee told CNN in a statement that the blast was caused by an "unidentified explosive device" at a college in the city of Kerch -- where a new 19-kilometer bridge links Crimea to Russia.

Russia's Investigative Committee said in a statement: "According to preliminary data, an unidentified explosive device packed with metal objects went off today in the dining room of the Kerch Polytechnic College."

It said information on the victims is being clarified and that "most of them are teenagers."

Sergey Aksyonov, the head of the Crimean government, said the suspected perpetrator of the attack had taken his own life, according to remarks carried on Russian state television.

"The alleged killer shot himself dead, committed suicide," Aksyonov told Rossiya-24, adding that the suspect was a student at the same educational institution, and that his body was found in a library on the second floor.

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Russia's Investigative Committee said Wednesday it had identified the alleged perpetrator and reclassified the case as a murder investigation instead of a terror attack.

The statement added that investigators and forensic experts were already on the scene, and added that initial examination of the bodies of the victims indicated they died from gunshot wounds.

Based on the picture of the crime, the investigation tentatively concludes that this young man shot the people in the college and then committed suicide," the statement read.

Russian officials said investigators were continuing to work on the site. News agency TASS said an explosive device had been found at the scene and was being inspected.

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