Shortly before 5 a.m. on Dec. 1, 2019, residents of north London were awoken by an extremely loud “bang.” Many took to the internet to raise concern, with some Londoners believing that the noise was an explosion, or something to that effect.
People even reported their cars and homes shaking.
The city is already on high alert after a stabbing on the London Bridge left two victims dead and three injured on Nov. 29, 2019.
However, the Royal Air Force and the local police confirmed that the noise wasn’t an explosion after all — it was a sonic boom resulting from RAF Typhoon jets breaking the sound barrier.
“Typhoon aircraft from RAF Coningsby were scrambled this morning, as part of the UK’s Quick Reaction Alert (QRA) procedures, after an aircraft lost communications in UK airspace,” an RAF spokesperson said in a statement to CNN, “The aircraft was intercepted and its communications were subsequently re-established.”
You can hear the sound in videos captured by surveillance cameras across the city.
This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.
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