Horses on the A414 near Welwyn Garden City

Traffic has been heavy on the M25 anticlockwise after two incidents near Potters Bar. Picture: Krish

Traffic has been heavy on the M25 anticlockwise after two incidents near Potters Bar. Picture: Krishan Bhungar - Credit: Archant

There are horses on the A414 near Welwyn Garden City, causing delays.

The disruption is on Hertford Road, coming off junction 4 of the A1(M), near to the small roundabout.

The road has also been blocked by an ambulance, though it is not yet known why it is there.