That may be, however I am making the point that they are not under any circumstances covered by Geneva, since a Terrorist goes after Civilian targets to make the most terrifying impression they can. And, as Jae pointed out in another thread, purposely targeting Civilians is against the laws and customs of war.
I don't know if they should be tortured. But, if the information needed is needed at that very moment in order to avert a catastrophe then I say go ahead and do it. If that case cannot be made... then, well, it matters on how badly the information is needed and what is done with it, and then if it was proven that they are indeed terrorists.