At least 11 people have died after two unidentified gunmen opened fire in a school in Russia's Kazan on Tuesday morning, according to reports.
One of the gunmen, identified as a 19-year old former student, has been detained, according to local media outlet Business Online.
A second gunman is still believed to be holed up inside School No. 175 in Kazan, the capital of Russia's republic of Tatarstan
One teacher and ten students have been killed in the rampage, the RIA Novosti news agency reported on Tuesday.
Footage from the scene showed several children jump out of the windows with gunfire heard in the background.
Tatarstan President Rustam Minnikhanov had arrived at the scene, agencies reported.
Images broadcast on state television from the scene showed dozens of people outside the school with fire services and police vehicles lining nearby streets.
Another video shot inside the school showed shattered glass and smashed windows.
"I was in class, I first heard an explosion, then gunshots," TASS quoted a teacher as saying.The motives of the attackers are unknown.