Fort Collins police are asking for help identifying an assault suspect after a physical altercation in Old Town. 

Fort Collins Police Services shared on Facebook that following an assault in the early morning hours of Sunday, July 28, they are still seeking the suspect involved. It happened near Remington Street and Oak Street (in the area behind the Aggie Theater and Tony's).

'The male suspect punched the victim, knocking him to the ground and causing serious bodily injury,' Fort Collins Police Services wrote. 'Officers have been actively investigating this case but have been unable to identify the suspect.'

They are asking the public to help identify the male suspect shown the security photos below.

All suspects are innocent until proven guilty in the court of law.