1 person is dead and 3 are injured after an explosion at a Russia's FSB intelligence agency

• One person was killed and three were injured after an explosion near an office of Russia's Federal Security Service in the country's north.
• The suspect entered the FSB building in Arkhangelsk and blew himself up at the entrance, state news agency TASS reported.
• He died of his own wounds, TASS reported.
• Bomb disposal experts are now working at the scene, TASS reported.

One person died and three people were injured after an explosion at the offices of Russia's security services (FSB) in northern Russia on Wednesday, local news agencies reported.

A man entered the FSB building in the city of Arkhangelsk, and blew himself up at the entrance, a spokesperson for Russia's Anti-Terrorism Committee told state news agency TASS. The suspected died of his own wounds.

"According to preliminary data, the person, who entered the building, took an unidentified object from his bag, which exploded some time later in his hands," the anti-terror agency said, according to TASS.

"As a result, he received fatal wounds."

Bomb disposal experts are now reportedly working at the scene.

Three staff members were injured.

A source told state news agency TASS that the person who was killed was not an FSB officer.