At least 10 people are thought to be dead after one or more explosions on St Petersburg's metro system in Russia.
Around 50 people are also believed to have been injured and the underground metro service in St Petersburg has been suspended.
Our Correspondent Daria Bondarchuck is in Moscow and reports that the authorises are not ruling out terrorism as a possible cause
IN: The authorities say an investigation is underway
OUT: who could be behind these
DUR: 26
http://www.fsnradionews.com/feeds/0403stpetersburg-db1.mp3
ALT
There are reports that the blast took place in between two metro stations, Our correspondent in Moscow Daria Bondarchuck explains that the St Petersburg metro would have been very busy at the time of the explosion.
IN: we know that these
OUT: 2:30 in the afternoon
DUR: 32 seconds