A 33-year-old man had parked his VW Golf at the junction of Hopwood Lane and Warley Road, Halifax, when he was attacked at 8.45 pm last night.(Tue)
He was walking away when his attacker - armed with a weapon believed to be a bat or iron bar - ran up to him and attacked him from behind.
The suspect then fled on foot leaving his victim with serious injuries.
He is being treated in hospital for injuries to his head and body.
The suspect is Asian and of a heavy, muscular build.
Any witnesses are urged to contact Calderdale CID on 101.