The two bangs heard around Northampton and Brackley were caused by Typhoon jets which had been scrambled from an RAF base in Lincolnshire to identify an unresponsive aircraft.
Fire crews were mobilised following reports of the explosions and people posted on social media about feeling tremors just before 4pm this afternoon (Friday 8 April)
Northamptonshire Fire and Rescue said crews were mobilised to reports of the explosions - but it was later confirmed the noise was caused by "two jets flying over the area creating a sonic boom".
A Ministry of Defence spokesman said: "Quick reaction alert Typhoon aircraft were launched today from RAF Coningsby to identify an unresponsive civilian aircraft.
The sonic boom was caused by a military jet intercepting an unresponsive civilian aircraft.
An RAF spokesperson said: “Quick reaction alert Typhoon aircraft were launched today from RAF Coningsby to identify an unresponsive civilian aircraft.
"Communications were re-established and the aircraft has been safely escorted to Cardiff airport.”
Jessica Buck describes hearing the sonic boom over Oxfordshire. She was working in Witney hen she heard a loud bang.
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
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Trains at Northampton station are being disrupted after a freight train broke down.
Passengers are warned that there could be delays until later this morning.
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Two lanes are closed and there is queuing traffic on the M1 Southbound between J17 M45 and J16 A45 / A4500 (Northampton West / Daventry) because of recovery work for an overturned van.
There is congestion back to J18 A5 / A428 (Rugby).
Police in Northampton have launched a murder investigation following the death of a woman at an address in Agnes Road in the town on Monday night.
Officers were called by paramedics at about 7.30pm on Monday, 21 March after reports of a woman having been seriously injured. The woman later died.
A 41-year-old man from Northampton, who was known to the woman, was arrested on suspicion of murder and is currently being held at the Criminal Justice Centre.
A forensic post mortem examination is set to take place at Leicester Royal Infirmary.
There are delays of up to an hour on East Midlands trains between Kettering and St Pancras due to a person being hit by a train.
Tickets are being accepted on Virgin Trains, Thameslink, London Underground and Cross Country services.
Trains may still be delayed until 18:00.
East Midlands trains tweeted the following updates:
#EMTUpdate: All lines have no reopened between Bedford and Kettering but trains and crews are out of place. We are now working to >>