Updated 3:49 p.m.
Sheriff's deputies found no evidence of gunplay on an elementary school campus Friday after a report of shots prompted a three-hour lockdown, authorities said.
"We have no evidence whatsoever that a weapon was discharged on the campus - no casings, no weapon, no firecracker," said Jan Caldwell, spokeswoman for the San Diego County Sheriff's Department. "If there were loud noises that mimicked gunfire, it was probably from the adjoining neighborhood."
A dispatcher received a call that shots were fired at 11:18 a.m. at Olive Elementary School, and sheriff deputies arrived on campus two minutes later, Caldwell said. She said investigators were considering the possibility that the call may have been a hoax, but believed it was sincere.
There were no reports of any injuries.
Sheriff's deputies detained a man who fit a description given by witnesses of a suspicious individual seen on or near campus at the time, Caldwell said. The man was taken to a sheriff's substation for questioning but was subsequently released.
About 100 parents gathered outside Olive Elementary School.
"My son is in kindergarten so I'm a little freaked out," said Eva Loman, who was waiting to get her 6-year-old son, Max. "I can't imagine what he thinks is happening."
Vista Unified School District put four other campuses on lockdown in response to the reports of "unconfirmed noises" heard on the Olive Elementary School campus, said Chuck Taylor, the district's chief operations officer.
The lockdown was lifted shortly before 3 p.m. Vista is located about 25 miles north of San Diego.
