British counterterrorism police have arrested three men in London on suspicion of spying for Russia.

The head of Britain’s domestic intelligence agency says China poses a daily threat to the United Kingdom’s security.

British counterterrorism officers have arrested four Iranian men over an alleged plot to attack an unspecified target and three others over a national security threat.

A special tribunal has rejected a legal claim against Britain’s domestic intelligence agency by more than 300 survivors of a bombing that killed 22 people at a 2017 Ariana Grande concert in Manchester.

The head of MI5 says Britain is facing a staggering rise in attempts at assassination, sabotage and other crimes backed by Russia and Iran.

More than 250 survivors of the bombing that killed 22 people at an Ariana Grande concert are taking legal action against the U.K.'s domestic intelligence agency.

An inquiry has found that Britain’s domestic intelligence agency missed a significant opportunity to prevent the suicide bombing that killed 22 people at a 2017 Ariana Grande concert in northwest England.