Is it the one that went off? Maybe?
This puzzles me. Grenades have to have the initiating mechanism in place to go off. Screw out the initiating mechanism and it takes a lot to set off the filler. Surely explosives experts would have removed the initiators before moving them.
I guess that if the grenade was very old and the filler was degraded it might be more sensitive and easier to set off, but it sounds to me like someone was playing around and got Darwined.
CSB: My reserve unit went to MCAGCC 29 Palms for live fire training. The night before we returned, the entire battalion had a complete dump everything on the rack gear inspection to ensure that no one took home any C4, live ammo, or other dangerous souvenirs. One Marine in my company had two live smoke grenades and one high explosive hand grenade in his sea bag. He had another HE grenade in his ALICE pack. A Marine in another company had three 40mm grenades, one of which was white phosphorus, in his sea bag. Explosions and the explosives that cause them make people stupid.