Counterterrorism officials say there is no credible or specific threat to the U.S. related to the upcoming anniversary of the death of terror leader Osama bin Laden.
A joint intelligence bulletin from U.S. Northern Command, the FBI and Homeland Security Department urges Americans to be vigilant because al-Qaida and like-minded groups continue to want to attack the U.S., and some have pledged to avenge bin Laden's death.
But officials say there is currently no intelligence pointing to a specific threat.
Bin Laden was killed last year in a May 2 raid by the U.S. military. He was living in a compound in one of Pakistan's suburbs.
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