A gunman has opened fire at a school in central Russia, killing at least 13 people and injuring 21, Russian officials say.

Victims include 7 children at the school of about 1,000 pupils in the city of Izhevsk.

The gunman has reportedly killed himself and the motive is unclear. Emergency officials are at the scene. One local MP said the attacker had been armed with two armed pistols. He has not yet been identified.