Lethal Weapon 3

A week before his retirement, L.A.P.D. Sergeant Roger Murtaugh (Glover) and his partner Martin Riggs (Gibson) are demoted to uniform duties after trying to defuse a bomb before the bomb squad arrived, causing the destruction of an otherwise empty office building. While on street patrol they witness the theft of an armored car, and help to thwart the crime assisted by armored car driver Delores (Delores Hall). One of the two thieves gets away, but the other is taken into police custody. The suspect is found to be a known associate of Jack Travis (Wilson), a former LAPD lieutenant who is believed to be running an arms smuggling ring in Los Angeles. The department is further concerned that the thieves were using armor-piercing bullets, informally referred to as "cop killers". Riggs and Murtaugh are re-promoted and assigned to work with Sergeant Lorna Cole (Russo) from internal affairs to track down Travis.