People reportedly felt a "mini earthquake" in Merseyside.
At around 11am today people living in Ainsdale and other areas of Southport said their houses and windows began to "shake."
Dozens of people took to social media and said they felt their houses "shaking" and claimed there was a "rumbling" noise.
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One person said on a local Facebook group: "Hi has there been a mini earth quake? My house and windows have been shaken. I live on Kenilworth."
Another person added: "Certainly sounded and felt like two pulses just before 11am. Workshop roof was shaking and very deep rumbling. House internal doors on the move too apparently."
A third person said: "I thought it was next door moving furniture those rumble sounds, now know what it was."
A fourth person also said: "Heard it too in Ainsdale, I wondered what the hell it was, sounded like someone kicking the doors in."
One resident, from Ainsdale, who wanted to remain anonymous said his "whole house violently shook".
He told the ECHO : "There was a loud bang and the whole house violently shook. We went upstairs to see if a wardrobe or something had fallen but couldn't see anything out of place."
He added: "When we saw other people talking about it on Facebook we thought it might be fracking but then I saw a jet had been flying around Southport at a similar time so I now wonder if it was a sonic boom."
People also reported feeling the "mini earthquake" in in Blackpool and Lytham in Lancashire.
According to a flightradar24 a Royal Air Force jet had been flying in the area around the time the "mini earthquake" was reported.
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