British counterterrorism officers have arrested several Iranian men over an alleged plot to attack an unspecified target.

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.