There has been more noise in the skies over the North Sea today as US fighter jets have been involved in training missions.
The aircraft from the US Air Force's 48th Fighter Wing division flew over East Norfolk just before noon.
Last week the USAF took part in a 'surge' operation with the British Army and about four times more planes took to the skies than normal.
This came to an end on Thursday, however there were more low flying and very loud planes in the skies above Great Yarmouth.
A spokesman for RAF Lakenheath said: 'Our fighter squadrons are not currently conducting surge operations this week, however, we are flying training missions also involving MoD aircraft and ground personnel.'
People took to Twitter to ask what the noise was.
The USAF planes based at RAF Lakenheath in Suffolk were last week 'surging' in support of a British Army training exercise at the RAF Holbeach range in Norfolk.
The exercise saw serviceman on the ground communicate with the jets circling at 20,000 feet, learning how to designate targets on the ground.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here