[sneakypete]

And how did Brown know to look under his car earlier to find the bomb?

This is virtually unheard of. Who normally looks under their truck?

He would have have to be suspicious for some reason to even look.

There is a chance Brown knew or suspected he had been caught screwing with or cheating people who don't tolerate that real well,and he planted the bomb himself to get police protection or notice.

[Ann Archy]

I think something was hanging down and a co-worker spotted it.