Bin laden was killed May 2 last year during a U.S. raid in Pakistan. Al qaeda and other terrorist groups have pledged to avenge bin laden's death.
In the past six months, counterterrorism officials have seen what they consider an increase in intelligence about potential threats from a Yemen group, known as al Qaeda in the Arabian Peninsula.
The terror group has twice tried to attack U.S.-bound flights and is considered the most active al Qaeda affiliate, recruiting Westerners.
A joint intelligence bulletin still urges Americans to be vigilant next week even though officials have not seen signs of current plots against the U.S.
The Associated Press contributed to this report.
