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The aircraft part believed to be from one of the hijacked planes that crashed into the World Trade Centre on 9/11 came from a wing, not landing gear.
Police said today that the 5ft part is a trailing edge flap support structure. It is located closer to the body of the plane and helps secure wing flaps that move in and out and aid in regulating plane speed.
Investigators initially thought it was part of the landing gear because both pieces have similar-looking hydraulics.
Workers discovered the part last Wednesday on the ground in a tight space between a luxury loft rental building and a mosque near the World Trade Centre site.
New York police say that part of what appears to be a section of landing gear from one of the jets that were flown into the World Trade Center during the 9/11 terror attacks has been found.
The debris was discovered wedged between two New York City buildings.
An investigation is now under way to see if any human remains can be recovered.
A large piece of airplane debris found close to the World Trade Center site in New York is believed to be landing gear from one of the planes which struck the twin towers in 2001.
The metal part has cables and levers on it and is about 3 feet wide and 1.5 feet deep.
New York Police Department Commissioner Ray Kelly said that it includes a clearly visible Boeing identification number.
Mr Kelly said the medical examiner would check the area around the site to see if it was toxic in any way.
"They will also check to see if there's any human remains at the site and then a determination will be made as to how to move the part from that location".
New York Police Department (NYPD) confirmed that the five-foot-long part was discovered by building surveyors between two buildings on the site where a mosque and community center has been proposed three streets away from Ground Zero.
The part bears a "Boeing" stamp, followed by a series of numbers.
Police spokesman Paul Browne said the NYPD had secured the location and would treat it as a crime scene.