Officials say the packages were removed but are still undergoing tests. The evacuation lasted about 4 1/2 hours.
NORAD evacuated 1,500 employees after employees discovered five suspicious packages. Staff were allowed back into NORAD after the packages were scanned and removed for further testing.
A visit to the animal kingdom can be a memorable family outing. Some of America's most popular zoos are in places you would least expect -- here's where to go and how to save some serious dough once you get there.