At the moment of explosion there were several dozen people in the building. No injuries were reported.
At this time, the building held a concert of Chopin, as well as language courses for immigrants.
On the scene of explosion promptly arrived policemen and firemen. As a result, no one was hurt. It is reported that on the device that exploded was a timer.
The immediate cause of the explosion was a homemade pyrotechnic device — iron bank with an unknown explosive inside. Someone threw it to the bin in the toilet.