The Associated Press reports that a test of a new first-responder wireless system, designed by Northrup Grumman, was conducted yesterday at the World Trade Center site.

"Some 100 firefighters participated in Sunday's simulated fire at 7 World Trade Center, which stands in the shadows of ground zero in downtown Manhattan," the article states. "The exercise included 20 mock injuries and a rescue from an elevator shaft, said Joseph Pfeifer, chief of counterterrorism at the Fire Department of New York. Officials tested sending surveillance video from the building's 50th floor to the network operations center and from there to the fire department's operations center in Brooklyn, allowing them to monitor the scene remotely."

"It's important for firefighters to come here -- this is a new building -- and to be familiar with the building and to practice our procedures," Pfeifer said. "This is a good day for the fire department, for our technology department and for the community. [It] reassures the Lower Manhattan community that we're there as we've always been."

More here from WNYC.