A 28-year-old homeless man was arrested after assaulting two people in separate incidents at an apartment complex that left a 61-year-old man with life-threatening head injuries on Monday night.

The assault occurred at about 7 p.m. at the Arbor Woods Apartments, located at 1800 S. 330th St. in Federal Way.

The suspect allegedly assaulted a 30-year-old man who was unable to remember many details due to his head injuries, according to the police report and Federal Way police Cmdr. Kurt Schwan. Police located a second victim, the 61-year-old, lying in the parking lot with life-threatening facial injuries.

Schwan added no weapons were used during the assaults.

The 30-year-old was treated at St. Francis Hospital, while the 61-year-old was transported to Harborview Medical Center.

Police arrested the homeless man and booked him into King County Jail for first-degree assault. The motive for the assaults is still under investigation, Schwan stated.