The incident is unfolding between J26 and J27 and has blocked the northbound carriageway.
Drivers are being urged to avoid the stretch of motorway.
There are so far no reports of any injuries.
TRAFFIC UPDATE: Lorry bursts into flames on the M1
A lorry has burst into flames on the M1 and looks set to cause tailbacks for miles.
By The Newsroom
Wednesday, 17th June 2015, 3:09 pm