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.
Got home from my DJ set & heard some crazy loud bang in North London - whatttt on earth was that?— DJ SIÂN KARLEUSA (@KARLEUSAxx) December 1, 2019
Thought I was bugging when i heard the loud bang. Went to knock of my flat mates door to be sure I wasn’t...now I’m hearing people in Luton and North London heard it too #explosion— Moyosola (@sophiee_belle) December 1, 2019
People even reported their cars and homes shaking.
Massive bang in north London. House shook so much bed moved off the wall. Any answers? Seems to be further north /east. Gas?— Rick Kelsey (@RickKelsey) December 1, 2019
Yeah, I'm in Enfield, North London, and my windows shook and car alarms went off.— Dawkins Dog (@DawkinsDog) December 1, 2019
I heard the Edmonton and Waltham Cross IRA bombs go off and this was way louder.
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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