At least 13 people have died and 21 others have been injured after a shooting at a school in Russia.
It happened in Izhevsk, a city in the Udmurt Republic, 1,200 kilometres east of the capital Moscow.
Russia's interior ministry, releasing a statement on Telegram, said the gunman had reportedly committed suicide.
"Immediately after the police received a report of a shooting at School No. 88 in Izhevsk, officers from the Interior Ministry of the Udmurt Republic went to the scene of the incident and organised measures to apprehend the suspect," it read.
Russia's Investigative Committee has also confirmed in a statement that it has launched an investigation.
"According to preliminary data, 13 people, including six adults and seven minors, were victims of the crime," it confirmed.
"Fourteen children and seven adults were injured. Information on the dead and wounded are being updated."
Authorities said the gunman had entered the school wearing a black t-shirt featuring "Nazi symbols" and a balaclava.
"He had no documents on him and his identity is currently being established," the Investigative Committee added.
The governor of Udmurt Republic, Alexander Brechalov, said on Telegram that a period of mourning for the victims had been declared until Thursday.
A series of school shootings in Russia in recent years has prompted President Vladimir Putin to tighten controls over gun ownership.
Last year, nine people, including seven students, were killed in a school shooting in Kazan.
A few months later, six people died and dozens more were injured in a shooting at Perm State University.
The deadliest school attack in Russia took place in 2004 in the city of Beslan when Islamic militants took more than 1,000 people hostage for several days. The
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