At least two US B52 bombers based at Britain's RAF Fairford base on Friday were seen taking off for the Gulf region ahead of a possible attack on Iraq, The Sky News reported on Friday.
But a spokesman for the British Ministry of Defense refused to confirm the report.
Fourteen long-range B-52 bombers have been deployed at Fairford, in Gloucester shire, southwest of England.
Fairford is around six hours flying time from Iraq.