PowerPoint Show by Andrew

The horrific blast occurred between Sennaya Ploshchad and Sadovaya train station in St Petersburg, Russia.

Ambulances raced to the scene of the carnage caused by a nail bomb which was detonated on the network.

Metro officials reported blast was from an improvised explosive device on board which included shrapnel. 

At least 12 people are reported to have been killed by the blast and 50 including children have been injured.

A nail bomb explosion on the metro in St Petersburg has ripped through a train carriage causing carnage.

Bodies lie strewn across the platform and the doors are blown open after the two blasts on the Russian metro network.

Bloodied passengers attempt to save those injured by the nail bombs.

A woman crouches over a man who has been injured in the blast as they are surrounded by carnage and blood.

Passengers disembark after two blasts kill at least 12 people.

Smoke fills the metro station in Russia after two nail bombs exploded.

 Commuters walk away from the carnage as smoke fills the station in St Petersburg, Russia.

Three men walk away from the train in a smoke-filled subway station after a huge blast from a suspected nail bomb.

General view of the mass gathering of emergency services attending the scene following explosions in a train carriage.

Firefighters line the streets of St Petersburg in the immediate aftermath of the blast that has claimed at least 12 lives.

Emergency services raced to the station as passengers flood out from the station after the explosions.

An injured person walks out of the metro station with a blood-drenched coat and red hands.

An injured woman is treated by paramedics at the scene.

A woman with a bandaged head is carried on a rescue blanket.

An injured person is helped by emergency services.

A picture on Twitter claiming to show a man being treated at the scene as blood pours from his head and onto his shirt.

A man with blood splattered all over his face walks away from the scene that killed at least 12 people and injured 50 more.

An injured passenger is helped by emergency services.

Men carry an injured person on a stretcher.

An injured person is helped by emergency services.

A second bomb, disguised as a fire extinguisher and packed with ball-bearings, was found and defused at a nearby station.

Russian officials have released this image of a man they believe is responsible for today's massacre on the city's metro train.

Firefighters, and a helicopter near St Petersburg metro in the aftermath of an explosion which occurred in a train at 2.40pm Moscow time.

Police officers guard the area at the entrance to Technological Institute metro station in St Petersburg on April 3, 2017.

Emergency vehicles and a helicopter are seen at the entrance to Technological Institute metro station in St Petersburg.

ISIS CELEBRATE BLAST 

Islamic State supporters have celebrated the explosions in St Petersburg saying it was revenge for Syrian air strikes.  

An ISIS supporter from the al-Minbar online forum said: 'We ask Allah to bless the operation by the lions of the Caliphate, we ask Allah to kill the Crusaders.'