A passenger who claimed to have a bomb on board an American Airlines plane in Miami was shot dead by a US federal officer, government officials say. The 44-year-old US citizen was shot by an air marshal when reaching into his bag after leaving the plane. Reports say no device has yet been found. Flight 924 had just arrived from Colombia, and was heading to Orlando. It is the first time since the attacks of 11 September 2001 that a US air marshal has shot at a passenger. A witness said that the man frantically ran down the aisle of the Boeing 757 and that a woman with him said he was mentally ill.