Russian secret services have exposed an ISIS cell linked to a knife-wielding teenage jihadist who attacked seven people before he was killed by police.
Dozens of young people, male and female, known to 19-year-old attacker Artur Gadzhiev - who wore a fake suicide belt - were detained in an unannounced sweep by law enforcement in western Siberia, it has been claimed.
At least four people including an alleged cell leader have been charged with terrorism offences, according to respected investigative newspaper Novaya Gazeta.
In the wake of the shocking knife rampage on August 19, Russian officials played down the incident as terrorism.
But a joint operation by the FSB security service and Investigative Committee - equivalent of the FBI - has now concluded there was an active ISIS "cell" in the major oil region of Khanty-Mansi nudging the Arctic Circle.