Police in Council Bluffs are investigating the circumstances surrounding an unconscious man found on the street early Saturday morning. Officers were called to the vicinity of 10th Street and Avenue B at around 5:42-a.m. to assist Fire Rescue personnel who were treating a man laying on 10th street.

The man was identified as 20-year old Jacob D. Combs, of Council Bluffs. Combs suffered from severe head trauma and was transported by Council Bluffs Rescue to Creighton Medical Center, where he was listed in critical condition Saturday afternoon. His injuries were described as life threatening.

Authorities are trying to determine the cause of his injuries. Anyone with any information is encouraged to call Crime Stoppers at 712-328-7867 or the Council Bluffs Police Department Criminal Investigation Division at 712-328-4728.