CHILLING images from inside the train carriage which was blown up by a suspected suicide bomber have been revealed showing the scale of devastation.

Dust and debris lie strewn across the carriage as pools of blood collect on the floor after the attack in St Petersburg killed 14 people.

The horror scenes, that saw bloodied passengers lying flat on platform floors, comes as Russian citizen Akbarzhon Jalilov, 22, has been identified as the suspected bomber by security services.

21 Horrific images from inside the carriage revealed the extent of the blast

21 Emergency services scoured the carriage for clues in the aftermath of the explosion

21 The bloodied bodies of injured passengers lie scattered on the ground yards from the train Credit: Rex Features

The Kyrgyz security service said the man believed to have been behind two bombs was born in Kyrgyzstan and obtained Russian citizenship.

National Security Committee of Kyrgyzstan (GKNB) said they are in contact with the Russian special services regarding the investigation, the statement said.

It is unclear whether the attack was a suicide bombing or whether the bomber got away.

It is believed the explosive device was hidden inside a backpack and carried on the train by the suspect.

Following the blast, a second explosive device was found and deactivated at nearby Vosstaniya Square station, Russia's Anti-Terrorism Committee said.

The same suspect is believed to have planted it.

Kyrgyzstan, a predominantly Muslim Central Asian nation of six million, is Russia's close political ally and hosts a Russian military airbase.

Horrified witnesses told of the moment they realised an attack had happened.

St Petersburg resident Leonid Chaika, said: "I saw a lot of smoke, a crowd making its way to the escalators, people with blood and other people's insides on their clothes, bloody faces. Many were crying.'

A woman who was also close-by said: "People were lying down, all black, scary, with a horrible smell of burned flesh."

21 The man has since handed himself into police to declare his innocence

A bearded "suspect" earlier identified by Russian media has since handed himself in and declared his innocence. He was last night pictured at a police station after being wrongly identified as the bomber.

Russian authorities are now trying to piece together what happened on St Peterburg's metro network when the explosion ripped through a train at around 2.30pm local time.

Terrifying video from the scene shows passengers frantically leaping from the mangled frame of the blasted carriage.

Amid conflicting reports about the nature of the blast, a police source told Interfax that a fanatic with links to radical Islamists was behind a suicide attack. This has not been officially confirmed by police.

Remains found at the scene are thought to mirror those commonly seen in suicide attacks and forensic teams are now scrambling to back up the theory with DNA evidence.

21 Russian media had published CCTV footage allegedly showing one of the suspects behind the attack milling around outside one of the bombed metro stations

21 Russian media has also published pictures of a further device left in the station that was later defused by bomb teams Credit: Universal News And Sport (Europe)

21 A second device — a shell filled with ball bearings to maximise casualties and left in a briefcase Credit: Universal News And Sport (Europe)

21 Images show injured people lying bleeding on a platform Credit: Twitter

21 The subway was hit by an explosion in the Russian city of St. Petersburg Credit: Rex Features

21 At least 14 people have been killed and 50 others are injured Credit: Getty Images

At least 14 people were killed and 50 injured when the deadly blast rocked a tube train between Sennaya Ploshchad and Sadovaya stations on Monday.

A scene of carnage was left in the carriage as its interior was littered with body parts.

Two victims were blown out the train in a tunnel before it came to a halt beside a platform.

A witness said: “People were bleeding, their hair burned. We were told to move to the exit because the movement stopped. People just fled.

“My girlfriend was in the car next to the one that exploded. When she came out she saw people mutilated.”

A second device — a shell filled with ball bearings to maximise casualties and left in a briefcase — was found a few hours later on the city’s subway system.

Russian President Vladimir Putin tonight visited the scene of the blast where he laid flowers.

He was later pictured chairing an emergency response meeting.

21 Vladimir Putin laid flowers at the scene of the attack on the St Petersburg metro network Credit: AP:Associated Press

21 Putin was later pictured chairing an emergency response meeting Credit: Getty Images

21 Medics carry an injured person on a stretcher outside Technological Institute metro station in St Petersburg Credit: Getty Images

21 An injured person is helped by emergency services outside Sennaya Ploshchad metro station Credit: Reuters

21 Emergency workers carry an injured victim from the Tekhnologichesky Institut station after the blast Credit: Getty Images

Putin, who was in the city to meet the Belarussian President Alexander Lukashenko, offered his condolences to the victims, after the anti-terrorism committee confirmed there are dead and injured.

He said: "I have already spoken to the head of our special services, they are working to ascertain the cause (of the blasts).

"The causes are not clear, it's too early. We will look at all possible causes, terrorism as well as common crime."

21 Fire fighters at the entrance to Sennaya Ploshchad station of the St Petersburg metro in the aftermath of the explosion Credit: Alamy

21 Fire fighters, emergency service vehicles and a helicopter are on scene Credit: Getty Images

Witnesses described the horror moment the bomb went off in the Russian city's metro station

21 The explosion occurred as the train was travelling between Sennaya Ploshchad and Tekhnologichesky Institut underground stations

В Питере взрыв в метро pic.twitter.com/HZvq7tqwXd — Philipp Kireev (@mynameisphiIipp) April 3, 2017

Foreign Secretary Boris Johnson tweeted that he was "horrified" by news of the blast.

The British Foreign Office was on hand to help any Brits caught up in the attack - but said there so far were no reports of casualties.

A spokeswoman said: "We are liaising with Russian authorities following explosions on the St Petersburg Metro.

"Our sympathies are with those affected and their loved ones."

Meanwhile, Donald Trump offered his condolences to the victims of the St Petersburg metro explosion.

According to the White House the US President called his Russian counterpart Vladimir Putin on Monday to offer "the full support of the United States government in responding to the attack and bringing those responsible to justice".

21 Russian President Vladimir Putin, left, and Belarus' President Alexander Lukashenko shake hands during their meeting at Konstantin palace in St.Petersburg, Russia Credit: AP:Associated Press

At least 14 people have died in the St Petersburg subway explosion Credit: Twitter

Footage from the aftermath of the blast showed people fleeing for their lives Credit: Twitter

Video shows terrified passengers running from the platform amid clouds of smoke.

One witness said: "I was riding down the escalator and suddenly an explosive wave from below, echoing from the tunnel."

Another told Russia's Life News: "People were bleeding, their hair burned. We were told to move to the exit, because the movement stopped.

"People just fled. My girlfriend was in the next car that exploded. She said that he began to shake.

People were bleeding, their hair burned. People just fled. Witness

"When she came out, she saw that people were mutilated."

The St Petersburg underground railway said in a statement: "An unidentified object supposedly blew up in a (train) carriage."

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

21 Tube terror... Women call loved ones at the entrance to Tekhnologichesky Institut station Credit: Getty Images

21 A woman reacts as firefighters attend the scene of the St Petersburg metro blast Credit: Getty Images

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

Islamic State, which has drawn recruits from the ranks of Chechen rebels, has also threatened attacks across Russia in retaliation for Russian military intervention in Syria.

The Russian air force and special forces have been supporting President Bashar al-Assad in fighting rebel groups and ISIS fighters now being driven out of their Syrian strongholds.