Today in Moscow, An explosion 2 train carriages in a metro station at Saint Petersburg 10 people were killed and several others were injured.

A huge whole was blasted in the side of one carriage with mangled metal wreckage strewn around the platform. Passengers were seen hammering at the windows of one closed carriage.

Authorities closed all St. Petersburg metro stations. Emergency services evacuate people from Saint Petersburgmetro following blast

As per source.