(CNN) -- A man shot his stepdaughter and her family Saturday, killing two of them before fatally shooting himself at a fast-food restaurant in San Bernardino, California, police said.
Two of the victims were young children, Lt. Jarrod Burguan of the San Bernardino Police told CNN.
A 33-year-old man and a 6-year-old boy were killed. The dead man's 29-year-old wife -- the guman's stepdaughter -- and a 5-year-old boy were wounded and were in critical condition at a hospital, Burguan said.
Witnesses told police that the man argued with the couple at a table at a Del Taco restaurant before he shot them multiple times. The shooter's body was found with two guns.
Police did not identify the shooter or his victims.