A pipe bomb that was found Monday in front of the main entrance to the El Dorado County Probation Department near Sacramento failed to explode possibly because it malfunctioned, authorities said.
The pipe was about 8 inches long and capped on both ends. It was attached to what looked like a makeshift fuse and "appeared to have been hastily dropped by unknown individuals," according to a news release from the El Dorado County Sheriff's Office.
About two dozen people from the Shingle Springs, Calif., probation office were evacuated while an explosives team investigated.
Authorities declared the scene clear about three hours after the pipe bomb was discovered. The investigation is ongoing.