St Petersburg suicide bomber Akbarzhon Jalilov waited for two hours before detonating his bomb waiting for the perfect moment to kill the greatest number of people.

Security forces said he walked around St Petersburg carrying a backpack containing the bomb before detonating the device on a crowded metro train.

Dzhokhar Tsarnaev, who was born in Kyrgyzstan, was convicted of planting bombs at the Boston Marathon on April 15, 2013, together with his brother Tamerlan Tsarnaev.

While no-one has yet come forward to claim responsibility for Monday's atrocity, the country's security services have previously said they had foiled 'terrorist attacks' on Moscow's public transport system.

Suspected bomber: Russian citizen Akbarzhon Jalilov, 22, left, 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 (right) have been released and shows him in a red Parka jacket and carrying a rucksack 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 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 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 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.

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.

An employee of Rosgvardiya neutralised it risking his life.

Among those killed was 20-year-old Dilbara Aliyeva, a third year student at St Petersburg Railway University.

A source at the university said: 'Like any girl, she had friends, big plans, and loved life.'She was a student in the Economics and Management Department.