NEW YORK —
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.
During street protests, they clashed with supporters of the center, who said it would promote harmony between Muslims and followers of other faiths.
The building includes a Muslim prayer space that has been open for three years. After protests died down, the center hosted its first exhibit last year. The space remains under renovation.
Donna Marsh O'Connor, who lost her daughter Vanessa Lang Langer in the attacks and is a member of September 11th Families for a Peaceful Tomorrow, called the landing gear discovery "bizarre."
O'Connor is a supporter of the Islamic center and said the fact that the plane fragment was found there "makes me think that this was the right place for a center that was going to heal the divide."
In a statement, Sharif El-Gamal, the president of Soho Properties, which owns 51 Park Place, said workers called the city and the police as soon as they discovered the landing gear. He said the company is cooperating with the city and the police to make sure the piece of equipment "is removed with care as quickly and effectively as possible."