6-year old California boy shot by 5-year old pal while playing with grandparents' unsecured gun

From a crime log, for Lake Arrowhead, California:

A 6-year-old Lake Arrowhead boy was shot by his 5-year-old playmate on Independence Day after the boys found an unsecured, loaded pistol in an unlocked closet and used it to play cops and robbers, a sheriff's report says. 

Sheriff's Capt. Rick Ells said the accidental shooting occurred at the home of the older boy's grandparents, in the 300 block of Oak Drive.

Every gun in the hands of a child must first pass through the hands of an adult.