Around 10 people are dead and an estimated 20 more are wounded following a bomb attack on a busy St. Petersburg subway train in Russia. A second device was found at a different subway station, and a bomb squad was called in to reduce it.

The device responsible for the deadly blast was hidden in a brief case and left aboard one of the train’s passenger cars. The bomb is said to have been made deadlier with the excessive shrapnel fragmentation materials used in its construction.

All subway stations within the city have been temporarily closed, and security has been tightened at all public transportation facilities. Russian President Putin was in the city at the time of the attack, meeting with the Belarusian president.