A 1.5 metre-tall piece of landing gear believed to be from one of the planes destroyed in the 11 September, 2001 attacks in New York has been discovered wedged between a mosque site and another building near the World Trade Centre.
The part includes a clearly visible Boeing identification number, New York Police Department spokesman Paul Browne said.
The twisted, rusted metal part has cables and levers on it and is about 0.9 metres wide and 0.5 metres deep.
The piece of equipment was discovered Wednesday by surveyors inspecting the lower Manhattan site of a planned Islamic community centre, at 51 Park Place, on behalf of the building's owner, police said.
The inspectors called police who secured the scene, documenting it with photos.
The spot where the landing gear was found is about three blocks from ground zero.
When plans for the mosque and community center were first announced several years ago, opponents protested that putting a Muslim facility near ground zero showed disrespect.
Supporters cited freedom of religion and said it wasn't too close to where the attack took place.
The medical examiner's office will complete a health and safety evaluation to determine whether to sift the soil around the buildings for possible human remains, police said.
Two hijacked planes slammed into the nearby World Trade Centre towers in 2001, killing thousands of people.