Watch: What caused the US to remove its bombers in such a hurry?
The Pentagon has confirmed that it removed its bombers - thought to be about a dozen B-1s - from RAF Fairford back to their home stations in America.
US media reported a new threat led to the bombers being removed, which follows a major incident on 27 September when police were alerted to three "suspicious vehicles" near the airbase.
A No 10 spokesperson said he would not comment on "foreign nations' military operations", but said the base was safe.
The BBC's security correspondent Frank Gardner explains what we know about the US's decision to withdraw its bombers from the base.
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