Police are asking for witnesses after a man was concussed following an assault at an Ōtorohanga walking track.

The victim and his wife said they were approached by an unknown male walking two dogs, one white and one brown on the Stopbank walking track about 5.10pm on July 28.

The male assaulted the victim, leaving him with facial injuries and a concussion, police said.

Police said the offender had not been found.

“We are asking anyone who has information about this incident or the parties involved to please come and speak with us,” police said.

“You can do so through our 105 service, quoting reference number 250729/4349.

“Information can also be shared anonymously through Crime Stoppers on 0800 555 111.”