- 4 updates
The US Air Force has apologised after one of its aircraft broke the sound barrier over Aberystwyth on Monday afternoon, apparently causing a sonic boom over the town.
Several F-15E Strike Eagle jets stationed at RAF Lakenheath in Suffolk were taking part in a training exercise at the time.
A spokeperson said the force offered "sincerest apologies for any disturbance or concern".
"At that time, several F-15E Strike Eagle aircraft were conducting a challenging air-to-air training mission.
"Typically, this would be carried out over water but the airspace to be used was lost to us and the jets were re-routed to the Wales Military Training Airspace" the spokesperson said.
"During the course of the training exercise, near the coast and in the vicinity of Aberystwyth, one of the aircraft, already travelling at high speed, inadvertently and briefly went supersonic at around 18,000 feet and in the process was likely to have caused the noise that was reported online."
Dylan Lewis, a resident of Aberystwyth, has described what happened when a suspected sonic boom shook the town earlier today.
He said "there was an incredibly loud boom. I thought the chimney had collapsed - so I ran out into the garden."
Morrisons supermarket in Aberystwyth had to close some of its tills, after tremors from a suspected sonic boom caused ceiling tiles to move.
The tills were closed briefly while staff checked for damage.
There have been other reports of rooms shaking, after many people heard what they thought was an explosion in the town.
People in Aberystwyth have felt tremors from a suspected sonic boom this lunchtime.
Owain Meredith from ITV News said it happened at around 1310, and the room shock with what initially sounded like an explosion.
He said two jets were seen flying overhead.