In yet another noteworthy development, police has arrested another man responsible for the terror attack on a packed London Tube train, which injured 30 people.
The 21-year-old was detained in Hounslow just before midnight on September 16, the Metropolitan Police force said in a statement. He was registered under Britain's Terrorism Act and taken to a south London police station, the force added.
British police arrested an 18-year-old man, earlier on September 16, in the port of Dover and raided a property in Sunbury, a small town outside London.
An improvised explosive device (IED) was detonated on a tube train at Parsons Green underground station during the morning rush hour on September 15.