Hundreds of people have reported hearing a large ‘explosion’ across London and as far north as Hertfordshire.
The bang was heard at about 4.20am local time, rocking homes and setting off car alarms.
Herts Fire Control tweeted: ‘We are currently receiving a large number of calls from across the whole of Hertfordshire regarding a large explosion sound. We are investigating.’
There are unverified reports that the noise may have been caused by two Eurofighter Typhoons taking off from RAF Coningsby.
Twitter user Natasha wrote: ‘Just been woken up by a massive explosion in North West London. Anyone else heard it?’
Omar Choudhry tweeted: ‘Can hear helicopters now in NW LONDON and my wife can hear sirens too. Worrying when you have kids hearing that dang #explosion.’
‘I live in hertfordshire and was on phone to someone in central london,’ Mike wrote. ‘I heard explosion 10-15 seconds before they did.’
Another, Nick Cowan added: ‘Anyone in NW London know what that noise was? Sounded like an explosion and it shook the house? Heart pounding. Not good.’
The Metropolitan Police tweeted: ‘We are aware of reports of a loud bang in the north London area. There are no reports of an explosion and police are looking into the incident. There is no cause for public concern.’
This is a developing story, more to follow
Twitter users are reporting hearing a large ‘explosion’ across London and as far north as Hertfordshire (stock image)