PLEASANT HILL -- An elementary school was evacuated and the bomb squad called after a person discovered a suspicious object in some bushes outside the school office Monday afternoon, authorities said.

No one was injured.

Pleasant Hill Elementary School students were evacuated to nearby Oak Park Christian Center about 1:05 p.m.

Police arrived and recognized it as a possible explosive device, authorities said.

An administrative assistant at the church said students had just been dismissed from school at 1 p.m. because of scheduled parent-teacher conferences when they were told to evacuate and go to the church. School staff were also evacuated.

The Walnut Creek Police Department's bomb squad arrived at the school on Oak Park Boulevard and rendered the object safe, police said.

By 2:30 p.m., students were sent home or picked up by parents and caregivers.

The Alameda County Sheriff's office also responded with dogs trained in sniffing explosives to ensure there were no more devices on the campus. None were found.

Police were still investigating if there was any link to an incident Friday night, when a group of juveniles were detained with an explosive device in the parking lot at College Park High School minutes after another explosion destroyed a mailbox nearby. No one was injured in that incident; three juveniles were arrested.


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Investigators are still looking at evidence in the case, which is ongoing.

Anyone with information should call the Pleasant Hill Police Department investigations division at 925-288-4630.

Reach Kristin J. Bender at kbender@bayareanewsgroup.com. Follow her at Twitter.com/kjbender.