Islamist suicide bomber's dismembered body is found: Former sushi chef from Kyrgyzstan 'who didn't say his prayers' is named as terrorist who murdered 14 as Kremlin calls St Petersburg train massacre a 'challenge to Putin'

• Russian Akbarzhon Jalilov, 22, born in Kyrgyzstan, named by security services as suspected suicide bomber
• His home country has seen up to 500 join ISIS and the Boston Marathon bombers were also born there
• The horrific blast occurred between Sennaya Ploshchad and Sadovaya train station in St Petersburg, Russia 
• At least 14 people were killed in yesterday's bomb blast and 50, including several children, were injured
• Nobody has claimed responsibility, but previous attacks on Russia have been blamed on ISIS and Chechens 
• Bearded man first identified on CCTV as suspect hands himself in claiming innocence and faces lie detector
• Kremlin has described the suicide bombing as a 'challenge' to Vladimir Putin, who was in the city at the time
• Transport bosses have reopened four stations which were shut down after an anonymous attack warning

A former sushi chef from Kyrgyzstan has been named as the suicide bomber who murdered 14 and injured 50 in the St Petersburgtrain massacre.

Russian citizen Akbarzhon Jalilov, 22, who was born in Kyrgyzstan, has been named by security services as the suspected bomber who also planted a second device hidden in a fire extinguisher that failed to explode.

Kremlin officials said parts of the attacker's body had been found at the scene a day after a train was blown up between Sennaya Ploshchad and Sadovaya metro stations in Russia's second city.

CCTV images of the suspect have been released, showing him in a red Parka jacket, carrying a rucksack on his back through the Metro while further images shows him walking along the street with both his fists clenched - potentially because he was clutching the trigger for his bomb. Police believe he has close links to radical Islamists.

A former friend, Ali Matkarimov, today said Jalilov - who was named by Kyrgyzstan officials - was once a sushi maker and was 'not even saying his prayers' when the pair worked together in the city in 2013. 

The Kremlin today described the attack as a 'challenge' to  Vladimir Putin adding that it was 'noteworthy' that it happened while the Russian President was in the city.

As hundreds gathered to mourn the dead this morning, the city's transport bosses reopened four stations which had been shut down following an anonymous call warning of another attack. 

Russian citizen Akbarzhon Jalilov, 22, who was born in Kyrgyzstan, has been named by security services as the suspected bomber who also planted a second device that failed to explode.  CCTV images of the suspect have been released and shows him in a red Parka jacket and carrying a rucksack

Russian citizen Akbarzhon Jalilov, 22, who was born in Kyrgyzstan

Former sushi chef Akbarzhon Jalilov (pictured) from Kyrgyzstan has been named as the suicide bomber who murdered 14 and injured 50 in the St Petersburg train massacre

A former friend, Ali Matkarimov, today said Jalilov (pictured) - who was named by Kyrgyzstan officials - was once a sushi maker and was 'not even saying his prayers' when the pair worked together in the city in 2013

A former friend, Ali Matkarimov, today said Jalilov (pictured) - who was named by Kyrgyzstan officials - was once a sushi maker and was 'not even saying his prayers' when the pair worked together in the city in 2013

This is believed to be the bomber in a red Parka jacket, wearing glasses and a dark green beanie hat and carrying a rucksack on his back - surrounded by unsuspecting Metro users

An explosion on the metro in St Petersburg has ripped through a train carriage causing carnage as the door is completely blown out 

Shocking: The horrifying pictures show bodies, blood wreckage and debris strewn across the carriage of the train, which was hit by the blast while travelling between Sennaya Ploshchad and Sadovaya metro stations. 14 people were murdered

Hundreds gathered to place flowers outside a St Petersburg metro station to honour the 14 people killed in Monday's devastating suicide bombing

Mourning: A woman lays flowers in Victory Square in memory of the St Petersburg Metro explosion victims this morning

Kyrgyzstan, a predominantly Muslim nation of six million, is a close political ally of the Kremlin and even hosts a Russian military airbase. But this morning it emerged that Akbarzhon Jalilov, the man suspected of being behind the St Petersburg massacre, was born in the Central Asian country

Carnage on metro platform as passengers tend to the wounded

Jalilov's home country of Kyrgyzstan, which borders Kazakhstan and China in central Asia, is predominately Muslim and has seen up to 500 citizens travel to Syria to join ISIS. 

Boston Marathon bombers Dzhokhar and Tamerlan Tsarnaev were also born there. It was the last of the Soviet republics to declare independence in 1991.