Threat of terror attack on Britain remains severe

Despite the killing of Osama bin Laden, terror threat to Britain remained "severe" and an attack could occur any time, the head of the metropolitan police has warned.

"To be blunt it means that an attack is highly likely and could occur without warning at any time," Sir Paul Stephenson said, according to a report in The Daily Telegraph.

Delivering the John Creaney lecture in memory of the Northern Ireland terrorism prosecutor, Sir Paul said "as government, the police and the security service assess the impact and consequences of the death of Osama bin Laden, it is clear that there can be no let-up in our vigilance."

He said that al-Qaeda was responsible for the injury and death of thousands of people worldwide and was committed to the use of terrorism and murder to achieve their aims.

"One man's death does not mark the end of an ideology and we must remain alert to the continuing threat from al-Qaeda, its affiliates and those acting alone," he said.

"Vigilance should be our watchword," he said.

"My message is a simple one: public awareness can provide an essential edge. Members of the public should trust their instincts and engage with us, reporting any suspicious behaviour which may be terrorist-related.