detonate

Officials say they suspect the detonating fuse on one of the rounds malfunctioned and caused the explosion.

An impact fuse detonates when it hits the ground, sending shrapnel into opposing forces territory.

He said the attackers detonated two car bombs, before infiltrating the compound where they were confronted.

Each round is about 2 feet long and essentially a very big bullet, made of up a detonating fuse, projectile, propellant and primer.

The CHP said that the shrapnel was from an explosive ordnance that was fired over Interstate 5 and “detonated overhead prematurely, striking and damaging a CHP patrol vehicle.”