Yeah, i noticed the way they skirted that information to. I wondered whether its because it wasn't clearly one thing, but maybe some mixture, so they were still working it out.

The other option I thought about was maybe its a household item and they're wary of copycats.

They also might not want to give people ideas.

I can't think of anything sane. That is, a high explosive in liquid form, that you'd actually carry around as a weapon, as opposed to set down in an empty field very carefully then run like hell.