Police are appealing for witnesses after a car crashed on the M25 yesterday.

A dark grey Nissan Micra hit the central reservation between junctions 27 and 28 heading clockwise shortly after 4pm on Monday 6 May.

The vehicle, which had two occupants, travelled across the carriageway and hit a concrete wall on the hard shoulder, before striking the central reservation a second time.

An air ambulance arrived at the scene shortly afterwards where a young boy was taken to the Royal London Hospital with life-threatening head injuries.

The male driver was arrested on suspicion of causing serious injury by dangerous driving and driving while under the influence of drink or drugs.

He was taken to hospital before being released into police custody, where he remains for questioning.

The motorway was closed for several hours whilst emergency services were on the scene which eventually reopened after 10.30pm.

A statement released by Essex Police said: “We thank drivers who have given us witness accounts and dash cam footage.

“We are keen to speak to anyone else who saw what happened, or saw a dark grey Nissan Micra travelling along the M25 before the incident.

“We are also keen to speak to anyone with dash cam footage.”

If you have information, please contact the Serious Collision Investigation Unit on 01245 240590 or email CollisionAppeal@essex.pnn.police.uk.