London Warned of Bomb Threat
Scotland Yard are investigating a "coded" bomb threat made against central London, on the eve of the Queen's visit to Ireland.
Police said on Monday that the warning did not give any details about the time or place of any device. The Guardian understands the warning was telephoned in to police late on Sunday afternoon by a caller claiming to represent the dissident republican cause. The caller used a codeword, although it was not recognised as being associated with any group.
Officers are already on high alert over the "severe" terrorist threat from al-Qaida-inspired violence, with the threat from Irish terrorism judged by MI5 to be one level lower at "substantial".
News of the warning was passed to officers going out on patrol and made public by police at lunchtime on Monday.
The Metropolitan police said: "A bomb threat warning has been received relating to central London today. The threat is not specific in relation to location or time.
"The Metropolitan police service, City of London police and British Transport police are working closely together and all officers have been advised to be a highly vigilant to ensure the safety of London. Policing operations and contingency planning remain under constant review and a wide range of overt and covert tactics will continue to be used in London.