"[The boys were] identified as Bryan and Christian Gonzalez, had been located back behind the family residence. Deputies responded, located the two boys," said San Bernardino Sheriff's Spokesperson Jodi Miller.
Authorities would not discuss exactly how both brothers were fatally shot, only to say that only the two boys were involved.
"Chino Valley Fire Department personnel did respond to the location, pronounced both boys deceased," Miller said. "Homicide investigators were called out to the location and are currently conducting an investigation as to what exactly happened to Bryan and Christian."
Authorities said there was no search for suspects.
The bodies were found in a ravine near a mobile home at 6281 Mystic Canyon Dr. in Chino Hills.
The call came in just before noon reporting shots fired. The department said it was a family member who called in to report that the two brothers were at the bottom of the ravine.
There are only four people living at the home, a mother, father and two kids (the victims). It was not clear who was home at the time.
Both of the boys were students at Butterfield Ranch Elementary. They lived less than a mile from the school on a large ranch.
On Tuesday evening, community members began a memorial on the entrance to the ranch.
Cameron Rogers went to Disneyland last month with Bryan.
"It's heartbreaking," said Rogers as he wept. "But he's in a better place now."
Counselors were expected to be on hand Wednesday morning to assist students and staff with coping with the deaths.
Anyone with information related to the case is asked to call sheriff's homicide investigators at (909) 387-3589.