A tunnel has reopened but traffic remains after a broken-down van blocked two lanes towards a river crossing.
Traffic was queuing for six miles due to the M25 anticlockwise towards the Dartford Tunnel from junction 1a towards Lakeside and Purfleet.
Congestion also grew after junction 3 near the Swanley Interchange.
The right-hand tunnel has now reopened following the earlier incident – the smaller left has always been open.
Emergency services have been asked for more information.
Mor as we get it. For travel updates listen to KMFM.
