All lanes on the M25 near Waltham Cross have been stopped following an incident, with drivers facing disruption on Tuesday afternoon.
The closure is described as affecting lanes towards Potters Bar, and the incident is said to be a mile from a major tunnel.
Details are still emerging. The nature of the incident, the vehicles involved, any casualties, the extent of any queues and when the road might reopen have not been confirmed.
This is a separate incident from the M25 crash near Potters Bar reported on Monday.
This is a developing story. Updates will follow as more information becomes available.
Drivers heading to Heathrow and across north London should also check the latest on the M25 closures planned across this week, while the Piccadilly line faces a five-day shutdown over the Halloween weekend.
