Victims of the recent school shooting in the Russian city of Izhevsk will be taken to Moscow for medical treatment. Authorities said 17 people have died so far after the incident and 24 others are injured.

Mikhail Murashko, Russia’s health minister, said that 15 of the injured individuals will be moved to Moscow. These included 13 children and two adults. He said three of them are in critical condition. 

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The shooting on Monday took place in School No. 88 in Izhevsk, a city 960 kilometers (600 miles) east of Moscow in the Udmurtia region, and was one of the deadliest school shootings in Russia. The gunman, a 34-year-old graduate of the school, killed himself after the shooting.

Russia’s Investigative Committee identified the gunman in Izhevsk as Artyom Kazantsev and said he was wearing a black T-shirt bearing “Nazi symbols.” No details about his motives have been released, and an investigation is underway. But local officials said he was registered as a patient at a psychiatric facility.

The government of Udmurtia said 17 people, including 11 children, were killed in the shooting. According to Russia’s Investigative Committee, 24 other people, including 22 children, were wounded in the attack.

Kremlin spokesman Dmitry Peskov described the shooting as “a terrorist act” and said President Vladimir Putin has given all the necessary orders to the relevant authorities.

Russia’s National Guard said Kazantsev used two nonlethal handguns adapted to fire real bullets. The guns weren’t registered with the authorities.

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School shootings aren’t common in Russia, but have become more frequent in recent years.

A shooter killed six people in a university in Perm a year ago. Just months before that, a gunman opened fire at a school in the city of Kazan, killing seven students and two teachers with a registered weapon. A student at a college in the Russia-annexed Crimean Peninsula killed 20 students and himself in 2018.