The United States Air Force is investigating how one of its fighter jets dropped an unarmed bomb on the Yorkshire countryside in northern England last week.
There were no injuries and only "limited property damage" in last Thursday's incident, a USAF spokesman said.
The 25 lb practice bomb was dropped by a F-15E Strike Eagle on a routine training run from a base at RAF Lakenheath in Suffolk, eastern England.
The bomb landed in a "sparsely-populated area" near the town of Market Weighton in Yorkshire, the spokesman added.
People living locally said the device landed on private land used by the Allied Grain plant on the Holme Industrial Estate in Holme upon Spalding Moor, East Yorkshire.
"Trained and experienced base personnel including Ministry of Defence, and local constabulary authorities responded to the scene and an investigation team is determining the cause the incident," the spokesman said.