At the time of the July 18 blast, the veteran deputies were working on two “military-style” grenades that had been taken into custody by authorities. One of the grenades detonated, and the other is unaccounted for,

Only one of two grenades that were found at a Santa Monica apartment building storage unit last week detonated the following day in East Los Angeles -- killing three sheriff's detectives -- but the second grenade is missing,

A grenade has not been found and remains missing after the explosion at an East L.A. training facility that killed three deputies, the sheriff says.