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.
