Some Boy Scouts and their dads returned to their vehicles to discover just about all of them had been broken into. It happened at Vivian Trailhead near Yucaipa.
Burglars shattered the windows of parked cars and made off with a lot of valuable items.
The San Bernardino County Sheriff's Department says at least 15 and possibly 20 vehicles were hit.
Authorities believe the burglaries happened very early Sunday morning. Deputies from Yucaipa were called to the parking area near the trailhead around 3:30 a.m.
The suspect or suspects went through the lot, smashing windows to gain access to the locked vehicles and then grabbing cash, computers and other valuables.
Several vehicles had been parked for a Boy Scout camping trip.
After enjoying a three-day outing in the woods, the owners returned and found their property had been stolen.
"Most of us had things stolen out of the car, from computers to GPSes, some cellphones," said David Chillinger, one of the burglary victims.
Authorities are working with the burglary victims to make a list of everything that was taken from their vehicles.
Some of the fathers who were on the camping trip say they had a great time and they're not going to let the theft ruin that.
If you have any information about this crime, contact sheriff's deputies in Yucaipa at (800) 78-CRIME.