At the begining of the movie, when the terrorists first enter the building, they enter using a big truck (only one truck). You see them open the back of the truck and the group of terrorists exit the truck led by Hans. They also have some equipment. The rest of the truck is empty. But at the end of the movie, there is an ambulance that comes out of this truck driven by Theo (the computer guy) that wasn't there from the begining. Where did this truck come from?? Also the ambulance leaves the truck via a ramp. Where did the ramp come from??