At least 10 people have been killed in explosions at underground stations in St Petersburg, Russian media report.

News agencies reported the blasts hit the Sennaya Ploschad and nearby Tekhnologichesky Institut stations in the centre of the city.

Images posted on social media showed a carriage in Sennaya station with its doors blown out with casualties nearby.

President Vladimir Putin said all causes, including terrorism, were being investigated.

The Interfax and RIA news agencies reported that at least 50 people had been injured. Interfax said one of the blasts may have involved a device filled with shrapnel.

President Putin was in St Petersburg earlier on Monday but is now outside the city, his spokesman Dmitry Peskov said.

"I have already spoken to the head of our special services, they are working to ascertain the cause," he said, at a meeting with Belarus President Alexander Lukashenko

The entire St Petersburg underground network has now been shut down, and Moscow metro officials said they were introducing extra security measures as a result.

A helicopter landed on the street to transfer the injured to hospital

St Petersburg's metro system is the 19th busiest in the world, with more than two million passengers every day.

While it has not suffered attacks before, in 2009, a bomb exploded on a high speed train travelling between Moscow and St Petersburg, killing 27 and injuring another 130.

The attack was later claimed by an Islamic group.

profhezekiah:
Religion of piss at it again

Iamwrath:
Let's not generalize

Escalze:
Putin won't take this likely

Jokerman:
Lol... Allah don drink again

unclejb2:
All terrorists are Muslims. Muslims and terrorism are like 5 & 6

madridguy:
This is serious. For those children of hates pointing their fingers at Islam I smh for you all.

Let keep the fingers across till any group claimed responsibility. From my own view, it might be Syria, Turkey or Ukraine.

ollah2:


Loads of terrorist attacks have happened and weren't orchestrated by Muslims.

If your logic is right then you should be dead by now.

Middle East game was not being fruitful enough, something enormous was needed in the heart of Russia to push it trigger an all out mess. Insane people are doing insanity and civilians like always having to pay the most.

Same people are behind all these attacks. Just executing with puppets. The puppets says Yes to wars cos it yields more money.

unclejb2:
all terrorists are Muslims. All these your conspiracy theories ain't gonna change nothing. Islamabad

Neoguru6:
Stay there until you die like chicken.