At least 15 people were killed in a school shooting in Russia’s Izhevsk on Monday afternoon, authorities confirmed. At least 21 people were also injured in the incident. The shooter was identified as Artyom Kazantsev, a 34-year-old who was a graduate of the same school.

Dmitry Peskov, the spokesperson of the Kremlin, categorised the incident as a “terrorist act” and said Russian President Vladimir Putin has been informed.

“President Putin deeply mourns deaths of people and children in the school, where a terrorist act took place,” Peskov told reporters Monday.

Artyom Kazantsev, who wore a t-shirt that had Nazi symbols, killed himself after the incident. He used two non-lethal handguns adapted to fire real bullets, according to Russia’s National Guard. 

Alexander Brechalov, the governor of the Udmurtia region, said that children were killed in the shooting. Russia’s Investigative Committee later confirmed that at least seven of the victims were children.

A criminal probe into the incident has been launched on charges of multiple murders and illegal possession of firearms. It is not clear if Artyom Kazantsev was a lone shooter. Authorities also did not comment on possible motives.

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The shooting took place in a school in Izhevsk, a city about 960 kilometers (600 miles) east of Moscow in the Udmurtia region. Those wounded were 14 children and 7 adults, the Committee said.

The school educated children between grades 1 and 11, news agency Associated Press reported. It has been evacuated and the area around it has been cordoned off, the governor said.

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Izhevsk, a city of 640,000, is located west of the Ural mountains in central Russia, about 960 kilometers (596 miles) east of Moscow.