The former patient stabbed five people at the Turtle Creek Valley Mental Health facility in Munhall, Pa., according to an article on the Pittsburgh Press-Gazette website.
The assailant was armed with a knife and an air pistol, the article said.
County police also found two knives among his belongings and two more near where he fell after being shot.
The complaint said the attacker also poured an accelerant on the floor of an elevator in the building.
Inside One of Healthcare's Most Ambitious Hospital Projects
Turning Condensate Loss into a Systemwide Steam Efficiency Opportunity
The Leapfrog Group Publishes 2026 Ratings for Hospitals and ASCs
Going Solar with No Upfront Costs
Northwell Health Finds Energy Savings in Steam Systems