bomb="PipeBomb" camcreate getmarkerpos "markername"
But I don't know how to touch it off, since the only way to do that is to give a action-command to a unit.
Unitname action ["Touch Off","PipeBomb"]
[thislist select 0] action ["Touch Off","PipeBomb"] would make hwoever activates the trigger touch off the bomb... I think. :-\
[edit]
:-\errr... on second thought, I don't think that last is possible
...