Here's everything we know about the St Petersburg metro bomb suspect

The man believed to be responsible for the bombing of a St Petersburg metro train that left 14 dead and injured 49 injured is a Kyrgyzstan native who obtained Russian citizenship, the Kyrgyz authorities have said.

The suspect has been named as Akbarzhon Dzhalilov. He was born in 1995 and is a native of Osh, located in the Fergana Valley in the south of the country.

Local media reports that he lived in St Petersburg between 2013 and 2014, at least.

On Monday afternoon, a bomb was detonated on an underground train after it left Sennaya Square station, one of the busiest transportation hubs in St Petersburg, Russia’s second largest city.

The train was able to reach the next station, the Technology Institute, where the full extent of the damage came to light.

Images showing a train with blown out doors and people attempting to rescue survivors then emerged on Twitter.

On Tuesday morning, as the country began three days of mourning, the death toll rose from 11 to 14.

MORE: St Petersburg mourns after deadly metro attack
MORE: Explosion in St Petersburg metro station ‘kills 10 people and injures 50

There was no immediate claim of responsibility for the attack, which came while President Vladimir Putin was visiting the city.

There are conflicting reports about whether Dzhalilov acted alone and whether or not he survived the attack. It is unclear if he has ties to Isis or any other militant groups.

He is believed to be either 22 or 23 years of age.

The Interfax news agency said that authorities believe the suspect is linked to radical Islamic groups and carried the explosive device on to the train in a rucksack.

In a statement, Kyrgyzstan’s State Committee for National Security said it is co-operating with Russian authorities to help the investigation.

Following the attack, a witnesses told 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. When she came out, she saw that people were mutilated.”

The United Nations Security Council condemned “in the strongest terms the barbaric and cowardly terrorist attack”.

US President Donald Trump called Mr Putin to offer condolences over the attack.

Mr Trump said it was “absolutely a terrible thing”, White House press secretary Sean Spicer said. He said the US was prepared to offer assistance to Russia.

In the past two decades, Russian trains and planes have been frequent targets of attack, usually blamed on Islamic militants.

Within two hours of the blast, authorities had found and deactivated another bomb at another busy station, the anti-terror agency said.

The entire St Petersburg subway system was shut down and evacuated, but partial service resumed after about six hours.