US military aircraft have been moved from a base in the UK.
The refuelling tankers were relocated from RAF Mildenhall in Suffolk to Germany and other locations following a reported threat from Iran, according to the Wall Street Journal (WSJ).
An MoD spokesperson said: "We do not routinely comment on the activity of other nations.
"Aircraft and other assets move regularly according to operational requirements."
The movement comes just weeks after US bombers were withdrawn from RAF Fairford in Gloucestershire following a suspected security incident linked to Iran.
Lucy Powell, Education Secretary, told BBC Breakfast: "I can't comment on ongoing operational matters but rest assured that we take the security and safety of our bases incredibly seriously and we will always act on security intelligence when we need to."
A US Air Force spokesperson said the relocation of aircraft is routine.
The spokesperson said: "US Air Force aircraft rotate between installations and operating locations for a variety of reasons including training and real world requirements.
"US military aircraft are hosted in accordance with access, basing, and overflight agreements with our Allies and partners.
"Due to operations security, we will not provide further information on movement of assets."
The reported movements at RAF Mildenhall follow a security scare at RAF Fairford, where a major incident was declared after three suspicious vans were seen near the base in September.
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The US later withdrew its bombers from the site and returned them to America.
Two British nationals appeared in court in October as part of an investigation into an alleged Iran-linked plot.
Eight men have been arrested in total as part of the ongoing counter-terror investigation.
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