Suicide bomber carried out St. Petersburg metro blast: report

MOSCOW, April 3 (Reuters) - A suicide bomber was responsible for the deadly blast in the St. Petersburg metro on Monday, a law enforcement source told Interfax, citing preliminary information.

The source also told Interfax that authorities had established the identity of the suspected suicide bomber and that the suspect was a 23-year-old from central Asia who had carried an explosive device into the St Petersburg metro in a rucksack.

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SAINT-PETERSBURG, RUSSIA - APRIL 3: Security forces take security measures around the area after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
An injured person is helped by emergency services outside Sennaya Ploshchad metro station, following explosions in two train carriages at metro stations in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov
REFILE - INCLUDING EDITORS NOTEAn injured person is helped by emergency services outside Sennaya Ploshchad metro station, following explosions in two train carriages at metro stations in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH
An injured person is helped by emergency services outside Sennaya Ploshchad metro station, following explosions in two train carriages at metro stations in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov
An injured person is helped by emergency services outside Sennaya Ploshchad metro station, following explosions in two train carriages at metro stations in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov
Emergency services direct pedestrians outside Sennaya Ploshchad metro station, following explosions in two train carriages at metro stations in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov
An injured person stands outside Sennaya Ploshchad metro station, following explosions in two train carriages at metro stations in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov
SAINT-PETERSBURG, RUSSIA - APRIL 3: Security forces take security measures around the area after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
SAINT-PETERSBURG, RUSSIA - APRIL 3: Health team workers are dispatched after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
SAINT-PETERSBURG, RUSSIA - APRIL 3: Health team workers and firefighters are dispatched after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
SAINT-PETERSBURG, RUSSIA - APRIL 3: Health team workers are dispatched after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
SAINT-PETERSBURG, RUSSIA - APRIL 3: Health team workers are dispatched after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
SAINT-PETERSBURG, RUSSIA - APRIL 3: Health team workers are dispatched after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
SAINT-PETERSBURG, RUSSIA - APRIL 3: Health team workers are dispatched after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
SAINT-PETERSBURG, RUSSIA - APRIL 3: Health team workers are dispatched after an explosion at a subway station in St Petersburg, Russia on April 3, 2017. At least 10 people were killed on the blast. (Photo by Sergey Mihailicenko/Anadolu Agency/Getty Images)
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Fire fighters at the entrance to Sennaya Ploshchad station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Sergei Konkov/TASS (Photo by Sergei Konkov\TASS via Getty Images)
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Emergency service vehicles at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Sergei Konkov/TASS (Photo by Sergei Konkov\TASS via Getty Images)
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Fire fighters and ambulances at the entrance to Sennaya Ploshchad station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Sergei Konkov/TASS (Photo by Sergei Konkov\TASS via Getty Images)
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Emergency service workers and ambulance workers at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Sergei Konkov/TASS (Photo by Sergei Konkov\TASS via Getty Images)
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Ambulance worker at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Sergei Konkov/TASS (Photo by Sergei Konkov\TASS via Getty Images)
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Emergency service workers and ambulance cars at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Peter Kovalev/TASS (Photo by Peter Kovalev\TASS via Getty Images)
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Fire fighters, emergency service vehicles and a helicopter in Moskovsky Prospekt at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Peter Kovalev/TASS (Photo by Peter Kovalev\TASS via Getty Images)
Emergency services personnel walk at the entrance to Technological Institute metro station in Saint Petersburg on April 3, 2017. Around 10 people were feared dead and dozens injured Monday after an explosion rocked the metro system in Russia's second city Saint Petersburg, according to authorities, who were not ruling out a terror attack. / AFP PHOTO / Olga MALTSEVA (Photo credit should read OLGA MALTSEVA/AFP/Getty Images)
General view of emergency services attending the scene outside Sennaya Ploshchad metro station, following explosions in two train carriages in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov
General view of emergency services attending the scene outside Sennaya Ploshchad metro station, following explosions in two train carriages in St. Petersburg, Russia April 3, 2017. REUTERS/Anton Vaganov
General view of emergency services attending the scene outside Sennaya Ploshchad metro station, following explosions in two train carriages in St. Petersburg, Russia, April 3, 2017. REUTERS/Anton Vaganov
ST PETERSBURG, RUSSIA -- APRIL 3, 2017: Fire fighters at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow time; according to Russian National Antiterrorism Committee several people were killed in the explosion. Peter Kovalev/TASS (Photo by Peter Kovalev\TASS via Getty Images)
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A man who was captured on surveillance cameras and earlier suspected of a role in the blast came forward to police and said that he played no role, Interfax reported.

Separately, Russian news agencies reported that President Vladimir Putin had met with security services over the incident and laid flowers at the metro station where the blast happened.

(Reporting by Alexander Winning; Editing by Alison Williams)

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