Suspicious devices found in school trash can in Clairemont

Devices reported at Lafayette Elementary School

SAN DIEGO - One of two plastic, 2-liter pressure "bombs" found at a Clairemont Mesa primary school exploded Monday, triggering a bomb squad and hazardous-materials rollout.

The two devices were reported on the playground at Lafayette Elementary on Printwood Way shortly before 8:30 a.m., Lee Swanson of the San Diego Fire-Rescue Department said.

"We do consider it a criminal case, and we're turning our information over to school police," he said.

Bottle bombs are made with household chemicals that, when mixed, gradually create enough pressure to cause the sealed container to explode. Dry ice is sometimes used.

School staffers took the unexploded bottle and the remnants of the other one into a custodial room before authorities arrived, he said.

The bomb squad determined that the remaining container was inert, and a hazardous-materials team determined that there was nothing hazardous in it or in the general area where the other one exploded.

Investigators believe the makeshift explosive devices were left on the campus at some point during the weekend.

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