Authorities say a high-powered rifle a suspect used to fire at state troopers during a pursuit before he was fatally shot on a Phoenix freeway was stolen from the Maricopa County Sheriff's Office.
Sheriff Paul Penzone says a second firearm stolen from the agency also was found in the suspect's truck after the shootout.
Penzone says an audit started in 2016 before he took office showed 29 firearms were missing.
Phoenix police say 27-year-old Arnaldo Caraveo was pronounced dead at the scene of Monday evening's incident that closed part of Interstate 17 for about 18 hours.
After an Arizona Department of Safety trooper used his patrol car to stop the suspect's vehicle, Caraveo fired numerous rounds from a rifle.
Mesa police officers and DPS troopers returned fire, killing the suspect.