Two men charged with robbing luxury watch had firearm of Christopher Dorner, who killed four people and died in 2013

Authorities are investigating how a gun registered to an infamous Los Angeles police officer ended up at the Airbnb of two men recently charged in the robbery of a $1m watch in Beverly Hills.

Investigators discovered the weapon earlier this month after they connected the Airbnb to a vehicle involved in another Beverly Hills theft, authorities said. The weapon was registered to Christopher Dorner, a former Los Angeles police department (LAPD) officer who killed the daughter of a former LAPD captain and her fiance as well as two others over nine days in 2013 before dying in a dramatic standoff with law enforcement. Dorner had felt he had been wrongly fired by LAPD, and accused the department of racism and corruption.