A Yemen-based al-Qaida group has claimed responsibility for the downing of a United Parcel Service cargo plane in Dubai in September.

Al-Qaida in the Arabian Peninsula also says it was behind the mail bomb plot uncovered by international authorities late last week.

A U.S. official has said that authorities have found no evidence that the crash of the Boeing 747-400 was caused by a bomb. Investigators still don't know what caused the fire that erupted on the plane's main cargo deck.