Bomb warning received in London

http://abcnews.go.com/Blotter/london-bomb-threat-irish-republicans-suspected/story?id=13611606

Three coded bomb threats by dissident Irish terrorists have been called in to London police in the past 24 hours, ABC News has learned, prompting a public alert by Scotland Yard on the eve of Queen Elizabeth II's historic trip to Ireland.

None of the threats mentioned the Queen's trip specifically -- which will mark the first time a British monarch has stepped foot in the Republic of Ireland in a century -- or President Obama's planned visit to London later this month, sources said. One threat mentioned a location, but no bomb was found in the area.

Scotland Yard acknowledged one of the threats and noted it was not specific in a bulletin posted on its website. The police force encouraged citizens to "continue to go about their business as usual but we encourage the public to remain vigilant and report any information about unusual activity or behaviour which may be terrorist-related..." Parts of central London close to Buckingham palace and government buildings were closed to traffic, according to British media reports.

The phoned-in threats are the latest in an aggressive campaign by Irish terrorists that has so far confined itself largely to attacks on police and security services in areas inside Northern Ireland that include Belfast, Omagh and Londonderry. An attack in London is an aspiration of the terrorists, British law enforcement and intelligence sources have told ABC News.