A 28-year-old man was fatally shot after an argument on a freeway ramp outside Los Angeles, California, police said Saturday.

The man got into a verbal altercation with the occupant or occupants of a car as he was merging onto I-105 on Friday evening, Downey police said.

"At some point during the road rage incident, a single gunshot was fired from the passenger side of the vehicle and the gunshot traveled into the victim's minivan and struck the victim," Downey police Sgt. Brian Baker said.
Investigators are searching for witnesses to the homicide and one of the vehicles involved, which fled after the shooting, police said.

The man, whose identity had not been released, was shot while riding with his wife and two sons, Baker said.

Emergency crews transported him to a local hospital, where he was pronounced dead. His wife and children were not injured, police said.

The shooting happened around 6:15 p.m. Friday (9:15 p.m. ET).