A 17-year-old boy has died and injured several others after he set off a bomb in the entrance of a branch of Russia’s main intelligence agency.

Governor Igor Orlov told Russian news agencies that an explosive device went off at the entrance of the Federal Security Service’s (FSB) office in the city of Arkhangelsk, in northern Russia.

Russia’s anti-terrorist committee said the person who was killed by the explosion was a man who had brought the explosive device in with him. The country’s investigative committee confirmed the person who detonated the bomb was a local teen.

Investigators also confirmed they are treating the attack as an act of terrorism.

Police officers blocking a road by the site of an explosion by the office of the Arkhangelsk Region Branch of Russia’s Federal Security Service (FSB) (Irina Skalina/TASS/Getty Images)

An “anarchist” claimed responsibility for the attack in a web posting, but the FSB were checking various theories as to the perpetrator.

According to Russia’s state-run TASS news agency, the man died while receiving medical help.

A fire truck seen at the site of an explosion by the office of the Arkhangelsk Region Branch of Russia’s Federal Security Service (FSB) (Irina Skalina/TASS/Getty Images)

The “anarchist” who had claimed responsibility allegedly posted in an online forum that the FSB “fabricates cases and tortures people”.

This unknown man is reported to have posted: “A terrorist attack will not be conducted in the building of the FSB in Arkhangelsk that I am taking responsibility for.

“Most likely I will die because of the explosion, because [the] explosive device will go off with me pushing the button installed on top of the bomb.”

A spokesman for Russia’s Anti-Terrorism Committee said: “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.

“As a result, he received fatal wounds.”

 

Emergency service cars parked near the FSB office (AP)

Three FSB employees were also injured by the deadly blast.

The injured victims are said to include a 32-year-old man, who suffered injuries to his head and arms, and a woman, who is being treated by doctors.

According to TASS, Mr Orlov said: “Work is being done to identify the explosive device and the causes and consequences of this tragic incident.”

Local reports said a “loud clap” and a “flash” was heard at the entrance of the city center building, which is near to a drama theatre and shopping malls.

The building was immediately evacuated following the blast.

Full details have not been immediately revealed about the attack, but security measures across all public offices in Russia have been boosted.

Bomb disposal experts also worked at the scene of the explosion and an investigation is ongoing.

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