A nine-inch pipe bomb was discovered in heavy brush near an underpass by volunteers participating in the Clean Up Utah activity Saturday morning.

At about 9:45 a.m., a child - among about 300 volunteers working in the area - picked up an object consisting of white PVC with caps on both ends while removing trees and brush at 250 W. State Street.Another volunteer told the child to put the object down and someone in the group notified police. The Utah County Sheriff's Office Bomb Squad responded to the scene and detonated the device without incident.

Investigators estimate the pipe bomb had been in that location for a month. "We think someone tossed it out a car window into the bushes," said Sgt. Jay Thornton of the Pleasant Grove Police Department.