All lanes have reopened following a crash on the M25

Emergency services were called to between j21 for the M1 and J20 for the A41 just before 1pm after a collision involving two vehicles.

Two people were taken to hospital.

Fire crews from Watford, Garston, and Kings Langley are at the scene.

At one point, three lanes were blocked. 

Delays which at one stage backed up to j22 for London Colney have now cleared.