Two suspected terrorists are on the run after a nail bomb planted in a St Petersburg train ripped through the carriages - killing at least 10 people and injury 50 today.
Several Russian media outlets have released the CCTV picture of the bearded suspect who was wearing a long, black top and a hat blamed for causing the carnage by detonating a bomb that was packed with shrapnel.
The terrifying incident took place on a train that was travelling between Sennaya Ploshchad and Sadovaya metro stations. A second explosive device disguised as a fire extinguisher was found and defused in a nearby station.
Nobody has claimed responsibility for the explosion, but previous attacks on Russia have been blamed on ISIS and Chechens.
A search warrant has now been issued for two people in connection with the attack - one for planting the bomb which detonated at Sennaya Ploshchad and the other for leaving an explosive device at Ploshchad Revolutsii station.
A source said: 'Two people are being sought on suspicion of planning the blasts, one of whom is thought to have placed the explosive device in the metro wagon and the second person for leaving a bomb at the metro station Ploshchad Revolutsii.'
Dozens have been injured, including at least three children, as it was reported the man left a briefcase on a train before moving carriages moments before the deadly blast.
Vladimir Putin is in his hometown of St Petersburg today for talks with the president of Belarus and confirmed 'there are dead and injured', offering his condolences to the families of those killed.
The Kremlin leader, who wanted to visit the scene in the aftermath of the attack but was held back by security services, 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.'
US President Donald Trump described the deadly bomb blast as an 'absolutely terrible thing' that is 'happening all over the world' before a working lunch with Egyptian President Abdel-Fattah el-Sissi.
The president did not make any further comment on the Monday blast that killed 10 people and injured about 40. There was no immediate claim of responsibility, but Russian trains and planes have been targeted repeatedly by Islamic militants.
Interfax news agency cited an unidentified source who says the suspect in Monday's blast might have left the explosive device in a bag.
A witnesses 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. When she came out, she saw that people were mutilated.'
A male eyewitness said: 'It's just like a war here. Every special service is here, the FSB, police, and multiple - really a lot of them - ambulances.
'I don't think I've ever seen to many paramedics in my life. Something completely horrible is happening here.'
Eight bodies were recovered from the carriage while two more were found on the platform or were in the tunnel.