Man critical after fall from Sydney cliff

A man is in a critical condition in hospital after falling from a cliff on Sydney's northern beaches after running from police.

Officers had attempted to pull over a vehicle on Warringah Road in Narraweena in the early hours of Friday, and when the car failed to stop a pursuit commenced, police say.

The 22-year-old driver then stopped his car and ran into bushland near Dee Why and a short time later officers found the man at the bottom of a cliff.

He was treated for major traumatic injuries to his chest, abdomen, an ambulance spokesman told AAP.

He remains in Royal North Shore Hospital.