An explosion sounding like a 'sonic boom' has been heard over Northamptonshire.
Sonic boom is a common name for the loud noise that is created by the 'shock wave' produced by the air-plane that is traveling at speeds greater than that of sound.
It usually causes a loud bang and tremors can be felt on the ground.
The fire service have confirmed that the sound was caused by two Typhoon jets flying in the area.
NFRS mobilised crews to reports of loud explosions heard around Npton/Brackley/, confirmed as two jets flying over area creating sonic boom
Sounded like a sonic boom heard here on campus in #Northampton Wondered what he had been doing since Spacemen 3