Predator 2 (1990)

LAPD lieutenant Mike Harrigan and his cocky detective partner Jerry Lambert soon realize that what seemed a bloody feud between voodoo high priest King Willie's Jamaican gangs and Ramon Vega's Colombian drug gang is actually the work of a scary third party. Peter Keyes's federal team shields the crime scene even for the LAPD. BUt after forensics proves it must be an alien, who keeps making victims, the chase brings them all together.