Breaking!!! At least 10 killed and 50 injured in explosions at two St. Petersburg subway stations

At least 10 people were killed in explosions in two train carriages at metro stations in St. Petersburg on
Monday, Russian authorities said.

Fifty people have been injured by the blasts, Andrey Kibitov, the head of the city governor's press service
said on Twitter. Seventeen ambulances are currently treating the injured, Kibitov said.

A Reuters witness saw eight ambulances near the Sennaya Ploshchad metro station.

Video showed injured people lying bleeding on a platform, some being treated by emergency services.

Others ran away from the platform amid clouds of smoke.

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.

The Moscow metro said it was taking unspecified additional security measures in case of an attack there.

Russia has been the target of attacks by Chechen militants in past years. Chechen rebel leaders have
frequently threatened further attacks.

At least 38 people were killed in 2010 when two female suicide bombers detonated bombs on packed Moscow metro trains.

Over 330 people, half of them children, were killed in 2004 when police stormed a school in southern Russia after a hostage taking by islamist militants.

In 2002, 120 hostages were killed when police stormed a Moscow theatre to end another hostage taking.

Putin, as prime minister, launched a 1999 campaign to crush a separatist government in the muslim southern region of Chechnya, and as president
continued a hard line in suppressing rebellion.