A woman has died and several people have been injured in a car clang following a police pursuit.
The three-car collision happened on Parklands in Waltham Abbey, Essex, at about 22:00 GMT on Thursday.
Essex Police said the incident followed a police seek involving one of the cars which men had been attempting to stop on the M25.
The woman died at the background, and the gate-crash has been referred to the Independent Office for Police Conduct.
Essex Police said police officers from the Bedfordshire, Cambridgeshire and Hertfordshire road policing part had attempted to stop the car on the motorway.
The scene of the collision will remain closed for some time, the force added.
It is not known how many other parties have been injured or if the woman was in the car being pursued by officers.
Essex Police has also requested witnesses and drivers with panache cam footage to contact them.