Hmmm.... slip a hose in the roof, and pump in some clear gas, put them all to sleep, walk in, take hostages out, then leave and let the terrorists wake up and have them notice that all of the hostages are gone, then play a loud speaker, "We have removed your hostages, now - surrender or die".
I know... I know.... could take 'em prisoner at the same time, but why ruin 1/2 of the fun?
Indeed you did! A good call.