You can blow them up without stepping on them. Use a DetPack or Proton Grenade. Or pick them up with the Pickup Kit key, if you placed them yourself. Oh, and you can blow them up with the AT-ST's grenades, too, I seem to recall.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.