A 9-year-old-boy who disappeared while camping with his family in the San Bernardino Mountains remained missing for a second day, and a friend said his family was concerned about reports that a truck was seen speeding from the area about the time he disappeared.

About 100 searchers fanned out through the mountains on foot, horseback and atop all-terrain vehicles Sunday in hopes of finding David Gonzales.

The boy was with his family at Hanna Flat campground (search) Saturday morning when he went to the family's truck to get some cookies and never returned, authorities said. His mother was only a short distance away, washing the family's dishes, when he vanished.

Witnesses told the family a large beige truck was seen racing away from the area at about the same time, but authorities said Sunday they did not suspect foul play.

"It's about the only thing that they could think that was a little bit strange," Pastor Phil Saenz said of the truck. "Within minutes the whole area, everybody, started looking for little David. So it's kind of hard for him to disappear in such a short period of time."

Volunteers, sheriff's deputies and U.S. Forest Service (search) personnel searched up to four miles from the campsite near Fawnskin, a small community north of Big Bear Lake (search) and about 100 miles east of Los Angeles.

A mountain lion was spotted on the other side of the lake on Friday, but searchers found no evidence the boy had been dragged away by an animal, said Cindy Beavers, a spokeswoman for the San Bernardino County Sheriff's Department.

"In light of the recent sighting, it's a concern, but at this point the search members are looking for a lost boy," she said Sunday.

The boy was reported missing by his parents, Jose and Rosenda Gonzales, of Lake Elsinore. They had been camping with families from their church.

The campground was full of people when David left after taking keys to the family's truck from his mother. The truck was less than 100 yards from the campsite and the keys had not been found, Beavers said.

Searchers were also using two helicopters and a search dog in hopes of locating the boy.