At least 11 people including students have been killed and several injured in a shooting at a school in southwest Russia, according to reports.
The RIA news agency said a blast was heard at the school in the city of Kazan, and a teenage gunman has been detained.
Footage posted on social media showed a large crowd outside the school after the premises had been evacuated, and emergency services including police and armed officers as well as paramedics at the scene, it reported.
Around 21 ambulances were sent to the site with local officials also turning up, Ria added.
A person, believed to be a suspect, is arrested in Kazan, Russia. Picture: IRN/Sky NewsInterfax news agency cited a source as saying that there were two attackers and the second could still be in the building.
A witness told TASS news agency there was an explosion before the attack was carried out.
Some students were seen jumping out of the windows to escape the shooting, it reported.
Reporter Diana Magnay said most of the victims are believed to be children, and one teacher may also have been killed.
"You can see video of the attacker being detained outside the school - being pinned down," she said.
"We have just heard from the regional governor that he was 19-years-old and licensed to carry a firearm.
"We have no idea of his motives yet. Clearly a horrific situation unfolding."
She added that the school had just re-opened after a 10-day holiday.
