Anchorage police have arrested a suspect they say hit a man with an encased rifle in the middle of the street during an argument late Friday night.

Officers with the Anchorage Police Department were dispatched to the 200 block of East Fifth Avenue just before 11 p.m. on Friday after someone reported an unconscious man in the middle of the street who might have been assaulted or carjacked.

An APD investigation found that the man was walking around the street while "displaying unusual, erratic behavior" when he approached an idle vehicle, a release from the department said Sunday.

"A verbal altercation ensued between the female driver and the male victim, and shortly thereafter the adult male passenger exited the vehicle with an encased rifle and hit the victim in the upper body with it," the release stated. "The blunt trauma was enough to cause serious injury."

Police say the man and woman fled the scene in their vehicle, but bystanders were able to provide officers with a vehicle description and plate numbers.

Officers found the suspect, 29-year-old Lemar Cooper-Mullen, over the weekend. He was remanded at the Anchorage Jail on a first-degree assault charge after being questioned by detectives.

The victim was transported to a local hospital for treatment. Police say this is an isolated incident and those involved did not know each other.

Copyright 2019 KTVA. All rights reserved.