Detecetives have release these CCTV images of a man they want to trace in relation to an assault.
The attack happened in Halifax town centre at about 2am on Sunday July 15.
A 34-year-old male was punched in the face while he waited for a taxi home in Wards End.
He suffered serious facial injuries and was taken to Calderdale Royal Hospital for treatment.
The suspect police want to be speak to is described as white, bald and was casually dressed.
Witnesses to the assault or anyone with information regarding the identity or whereabouts of the man should call PC Nick Turner in Calderdale CID on 01422 337 086 or 101.