The Ministry of Defence has confirmed a loud bang heard by people across Oxford and Swindon was a sonic boom from a Typhoon aircraft. Emergency services were in inundated by calls from people who heard the loud bang.
A Sonic Boom happens when an aircraft flies faster than the speed of sound, creating shockwaves. It was caused by two Typhoon jets from RAF Coningsby, sent to help a helicopter which accidentally put out an emergency signal.
These people in Swindon describe what they heard: