A bomb squad was called after a worker found several sticks of dynamite attached to a timing device at an e-waste recycling facility in Riverside on Thursday.
The employee made the discovery while working at Gold’n West Surplus, Inc., which takes apart old electronics.
The device was placed in the back of a truck until a California Highway Patrol officer was finally flagged down, according to police.
Bomb squad investigators from the Riverside Police Department determined the dynamite was inert after bringing in a robot to examine the device.
An area “well beyond what was recommended” was evacuated during the investigation, police said.
KTLA’s Courtney Friel contributed to this report.