New explosives obtained from a building in Russia's St Petersburg

The Russian Investigative Committee has identified 22-year-old Akbarzhon Dzhalilov, a Kyrgyz-born Russian citizen, as the bomber behind the attack.

"Last night, a group of radical [s]. carried out a brazen attack on employees of the traffic police", Alexander Zhilkin said in a statement.

Russian emergency officials say they have closed a subway station in St. Petersburg following a bomb threat. Hours later, anguish and fear rose again when police found and defused a shrapnel-packed explosive device at another St. Petersburg station. Officials in Kazakhstan said they were co-operating with Russian authorities, although it was not clear if there was an additional suspect from that country.

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

"We can state today that 14 people have died", said Veronika Skvortsova, adding that 49 people are still hospitalised after the explosion on Monday afternoon. "Because we have not experienced anything like that for a long period of time in Russian Federation". I think the key thing is, given that we will now probably see quite a stepping up of security in the short-term, if there are still more attacks, then I think this does spell exactly what the security services have been anxious about, which is actually a resurgence of terrorism.

The National Anti-Terrorism Committee said it was looking for the "perpetrators and organizers of the terror attack".

An Orthodox priest stands at a symbolic floral memorial at Technologicheskiy Institute subway station in St. Petersburg, Russia, Tuesday, April 4, 2017.

Mr Trump said it was "absolutely a awful thing", White House press secretary Sean Spicer said.

Dzhalilov visited his home country about a month ago, and unlike past trips when he traveled directly back to St. Petersburg, he returned via Moscow.

"I told (Putin) that terrorism is unforgivable, no matter the reason, and I resolutely condemn it", Abe said.

The statement Wednesday says: "At this moment the investigators have no evidence of connection or acquaintance of the detained with executor of the terrorist action in the St. Petersburg metro". It's unclear if the raid Thursday was linked to the attack earlier in the week.

The bomb went off on a train under Russia's second-largest city on Monday, killing 14 people and injuring dozens.

Photographs from the station platform showed a blue train carriage with its door reduced mangled and twisted by the force of the blast.

When Dzhalilov blew himself up, 10 other passengers were killed instantly.

  • Leroy Wright