Two unidentified attackers were reported to have opened fire at a high school in the Russian city of Kazan on Tuesday.
The Russian news agency Interfax reported that at least 9 people — eight pupils and a teacher — had been killed in the incident.
While one of the attackers, a teenager, was reportedly detained, Interfax cited a source saying a second gunman could still be in the building.
The RIA news agency said an explosion had been heard at the school.
The motive for the attack was initially unclear.
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