Saint Petersburg’s Alexander Mozhaisky military academy was the site of a non-life-threatening explosion Tuesday, with three people injured, Russia’s Defense Ministry said.
An unidentified explosive device went off early afternoon inside the staff premises of an administrative building of the academy, which trains officers for the army’s missile defense unit.
The blast caused a staircase to collapse. About 20 people were trapped.
On Tuesday, nearly a dozen suspects went on trial at a military court in the city. They were charged with helping to organize a 2017 bombing in the Saint Petersburg metro that was claimed by a little-known outfit linked to al-Qaeda terrorist group.
Fifteen people died when a bomb went off on a train in the metro. About 70 people were also injured.