A loud "explosion" has been heard across Essex - reaching as far as Billericay.
The loud bang was heard at roughly 6.45pm and sparked concern as residents began to call emergency services - with some taking to social media to describe their house "shaking".
It has been confirmed as a sonic boom from a passing aircraft.
Reports were coming in from all over Essex including Harlow, Brentwood, Chelmsford and as far as Billericay.
Bishops Stortford police tweeted: “Large number of 999 calls coming in about a loud explosion. We have liaised with @EssexPoliceUK who are confirming that this is a sonic boom from a passing aircraft."
It is believed the sonic boom was caused by RAF Typhoons as they broke the sound barrier.
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