Passengers have been told to expect more armed officers patrolling transport hubs as the threat level is increased to “severe”.1bombThe Joint Terrorism Analysis Centre has raised the threat level for London transport to “severe”, meaning “an attack is likely” and police have urged commuters to be vigilant and report anything they feel is suspicious.

Patrols are already in place by British Transport Police on the Underground network, but have been re-enforced with armed units after a “suspicious item was found” on the Jubilee line at North Greenwich tube station on Thursday (October 20).

The discovery led to a 19-year-old’s arrest in Holloway Road on Friday (October 21) in a dramatic swoop involving the Army’s bomb squad and and counter terrorist detectives.

A Scotland Yard statement read: “The 19-year-old man was arrested on suspicion of the commission, preparation and instigation of terrorism acts, under Section 41 of the Terrorism Act 2000. He has been taken to a London police station where he remains in custody.”