Loud bang heard across Kent caused by sonic boom from RAF typhoon jet which flew over county and caught on Ring doorbell | Updated: 16:38, 12 January 2021 This is the moment a military jet caused a huge bang which shook homes across Kent. The loud explosion was caused by a sonic boom from an RAF Typhoon which flew over the county today - and the moment was caught on a video door bell. Thousands of people took to social media to ask others what the noise was. People reported hearing it in Borstal, Rochester, Gillingham, Gravesend, Greenhithe and Meopham and even Swale. The aircraft is thought to have been scrambled to escort a Bombardier Global Express business jet into Stansted.