Local news sites said a homemade bomb destroyed a staircase at the prestigious Mozhaisky Academy – as cops said they were treating it attempted mass murder.
There were also unconfirmed reports of a second explosion from a TM-57 anti-tank mine which had been stored at the academy.
Cadets and instructors were evacuated from the building before the blast on the second floor, but around 15 people were trapped on the level above when the staircase collapsed, according to local TV channel 78 News.
Later the Fontanka news agency reported the blast was caused by a “selfmade” improvised explosive device equivalent to 200 grams of TNT.
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Source: The Sun