A man was attacked after he challenged five men who were relieving themselves in the street.
Police said the 30-year-old was assaulted by a group “who he had spoken to after observing them urinating in the doorway of a bank”.
He needed hospital treatment after suffering facial injuries in the incident on Northgate, Cleckheaton, in the early hours of Saturday.
Officers believe the group were drinking in the George pub earlier in the night.
Spen Valley Neighbourhood Policing Team want to speak to witnesses. Call 101.