Kerch Info News via AP

At least 19 students were killed and 53 wounded in a shooting at a vocational school in Crimea on Wednesday.

Of the wounded, 12 are in serious condition. Police say the suspect, 18-year-old Vladislav Roslyakov, killed himself inside the Kerch Polytechnic College library. He was described as a "shy loner," The Associated Press reports, and local officials said he just recently was granted a permit to own a shotgun and only a few days ago purchased 150 cartridges. Sergei Aksyonov, regional leader of Crimea, said Roslyakov was "walking around and shooting students and teachers in cold blood."

There was confusion throughout the day, with Russian President Vladimir Putin saying at one point the victims all died in an explosion at the same time Russia's Investigative Committee said the students were all shot. Explosive devices were found on campus. In 2014, Russia annexed the Crimean Peninsula from Ukraine, and this is Russia's greatest loss of life in an act of school violence since the three-day school siege in Beslan in 2004, which left 333 people dead.