SUMMARY:

An explosion occurred on a St. Petersburg Metro Train - between Sennaya Square and the Institute of Technology

At least 10 dead

At least 50 injured

Device was an IED with shrapnel - left in a briefcase

Entire Transit system shutdown

Putin considering possible terrorist links

A second explosive device has been found and disabled

has been found and disabled Russian news reports say that a security camera has caught a person who could be responsible for a blast on St. Petersburg subway.

Live Feed:

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Update 5 : Explosive device was left in briefcase in metro carriage - Interfax. There was no immediate claim of responsibility for the blast.

Update 4: A second device has been found - Russian anti-terrorism committee says it has found and deactivated a bomb at another St. Petersburg subway station.

The National Anti-Terrorist Committee has confirmed that a makeshift bomb has been found at the Ploshchad Vosstaniya metro station in St. Petersburg and disposed of. "At the Ploshchad Vosstaniya metro station in St. Petersburg a makeshift explosive device was found and rendered harmless on Monday," National Antiterrorist Committee spokesman Andrey Przhezdomsky told the Rossiya-24 television news channel. "It was done promptly and professionally." "Special services and law enforcement agencies keep taking crucial measures to identify and avert terrorist threats," the National Anti-Terrorist Committee said.

Update 3: The Mail is reporting at least 50 injured including children. Bloomberg reports the device was an IED with shrapnel.

The entire transit system has been shut down as bomb squads and rescuers are responding to the emergency.

Russian president Vladimir Putin says authorities are considering all possible causes of St Petersburg metro explosion including terrorism.

Russian president Vladimir Putin says authorities are considering all possible causes of St Petersburg metro explosion including terrorism — Sky News Newsdesk (@SkyNewsBreak) April 3, 2017

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Update 2: Russian news services reporting at least 10 dead... (via TASS)

... at least ten people were killed, according to the Russian news agency TASS.

Preliminary reports indicate that some 10 people may have been killed and 20 injured in the blast, news agencies said citing sources close to the investigation.

The Tass news agency and Reuters said that 10 have been killed.

Interfax also said about 10 had died, with about 20 injured.

Selfie nation strikes once again...

Update 1: More details of a possible second explosion at the "Sennaya Ploschad [square]" Station note at least 10 people were injured.

Fire brigades are investigating reports of smoke at the Sennaya Ploshchad metro station in the Russian city of St. Petersburg, a regional Emergencies Ministry official told Sputnik on Monday. "Preliminarily, there is strong smoke. Smoke protection service experts have been dispatched. The source of the smoke is being investigated," the source said.

Seven stations closed on city subway network - "Victory Park", "Electrosila", "Moskovskiye Vorota", "Frunze", "Institute of Technology", "Sennaya Ploshchad", "Gostiny Dvor".

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As we detailed earlier, reports are coming of an explosion at the Teknologicheskiy Institut metro station in St.Petersburg, Russia that has left several injured...

The metro management said they received reports of an explosion inside the car, possibly of an improvised explosive device.

Rosbalt reports that (via Google Translate)

At the train station "Technological Institute", an explosion occurred. This was reported by eyewitnesses. According to them, many people have suffered as a result of the incident. On the published photo shows that the car door is badly damaged. Station platform clouded by smoke. Details are not yet known. Official comments yet failed to get.

The situation does not look good...

There are many ambulances present already...

The station has been evacuated...