Twitter users are reporting 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.’  

We are currently receiving a large number of calls from across the whole of Hertfordshire regarding a large explosion sound. We are investigating.  

Twitter user Natasha wrote: ‘Just been woken up by a massive explosion in North West London. Anyone else heard it?’

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.’ 

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)