THE loud bang heard over the town this evening was a sonic boom.

A spokesman for the Ministry of Defence said: “It was a super-sonic boom from a Typhoon jet. Two aircraft went up in response to a helicopter, which let out an emergency signal by mistake. “It is thought the helicopter was over the Oxfordshire area. The Typhoon aircraft, based in Lincolnshire, are part of a quick action alert team that respond to anyone who puts out that kind of signal. Fortunately, it was a false alarm.”

The noise and vibration was heard across Swindon at approximately 6.20pm.

It was heard as far north as Coventry and as south as Bath