The Daily Star's FREE newsletter is spectacular! Sign up today for the best stories straight to your inbox Sign up today! Thank you for subscribing See our privacy notice Invalid Email

Shocked residents in Alabama were left so alarmed they even called cops to report the “suspicious sound” on Monday night.

The noise – dubbed the “‘Bama Boom” – was so powerful it actually shook houses and left windows rattling.

One terrified person tweeted: “I heard and felt an incredibly loud boom from inside my home in Moody around 1:40-1:45pm today. Shook the entire house”.

Another wrote: “This was heard across multiple counties this afternoon… doesn’t appear to be related to a geological event.”

While the booms have been heard at least 64 times in cities and towns across the United States, experts are still struggling to explain what causes them.

(Image: GETTY)

Theories have ranged from the noises being made by supersonic aircrafts to meteors blowing apart in the atmosphere.

The Birmingham Alabama National Weather Service said it has “no answers” for the source of the boom.

It tweeted: “Re: loud boom heard: we do not see anything indicating large fire/smoke on radar or satellite; nothing on USGS indicating an earthquake.

“We don't have an answer, and can only hypothesize with you. 1) sonic boom from aircraft; 2) meteorite w/ current Leonid shower?”

Mysterious loud noises have left people baffled and worried before.

In March, Nottingham residents recorded an “alien hum” coming from the sky above the city.