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The possible threat was reported at about 7:30 p.m. in the 2000 block of South Coast Highway 101 in Encinitas.

A lieutenant with California State Parks told 10News that a call was picked up by an employee working in a kiosk. The caller said in vague terms that there was a bomb about to explode. He said to run and then hung up.

Sheriff's deputies from Encinitas joined officers from State Parks and searched the bushes in the campground. They searched on the beach below the campground as well.

The area was temporarily blocked off as authorities conducted their search.

"Well, we went to dinner and came home, and all of a sudden, the camp was closed," said camper Carol Ambrosia.

Camper Mike Seaman had no idea what was going on until later hearing about the phoned-in threat from a deputy.

"We met a guy down below who said his daughter was having to walk down from the restaurant parking area because they weren't letting anybody in, so obviously something was happening here," he said.

A state park volunteer kept vehicles from entering the park until about 9 p.m., when it was deemed safe enough to drive back inside.

No campers were evacuated or even notified about the threat.

"We had no idea… had no clue," said Ambrosia. "I don't think the rest of the campers knew it. It's not a big thing. It's just a threat. It's no big deal."

10News was told officers tried to trace the phone call, but the phone number was a non-working number.

No device was found.