http://www.katc.com/Global/story.asp?S=3775312

"Everyone entering was patted down, went through a metal detector and watched National Guard members search their bags. It was a thorough search -- people had to put hands on head and even clothing seams were checked.
General Ralph Lupin said 360 guardsmen were in the dome and 200 more were on the way."

It's not mentioned WHAT they are looking for, but I'll presume airport-style restrictions.