"The odds of this being wedged between there is amazing," Browne said, adding it was not surprising that it went undiscovered for more than a decade given the location. "It had to have fallen just the right way to make it into that space."
Other World Trade Center wreckage had been discovered at the buildings and around the area in years past.
Police detectives and National Transportation Safety Board investigators will determine whether the equipment is from the American Airlines plane or the United Airlines plane that slammed into the twin towers on Sept. 11, 2001, destroying the towers and killing nearly 3,000 people.
When plans for the Islamic center, about three blocks from ground zero, were made public in 2010, opponents said they didn't want a mosque so close to where Islamic extremists attacked. They argued the site was "sacred" because landing gear from one of the hijacked Boeing 767 jets had punctured the roof of the building on Sept. 11.
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