A man has suffered facial injuries after an assault near the A9 Inverness-Thurso road at Alness.
Two men were walking their dogs on the footpath from Alness Industrial Estate to the Catalina at around 8pm on Wednesday.
At the underpass, a third man assaulted one of the walkers.
The attacker is described as around 5ft 6in, stocky build and dressed in dark clothing.
Police have asked anyone who witnessed the incident or has any information to contact them on 101 or Crimestoppers on 0800 555 111