NYPD Deputy Commissioner Paul Browne said:
A part of a landing gear, apparently from one of the commercial airliners destroyed on September 11, 2001, has been discovered wedged between the rear of 51 Park Place and the rear of the building behind it, 50 Murray Street, in lower Manhattan. The NYPD is securing the location as it would a crime scene, documenting it photographically and restricting access until the Office of the Chief Medical Examiner completes its health and safety evaluation protocol, after which a decision will be made concerning sifting the soil for possible human remains.
Browne also said that the plane part won't be immediately removed though he did confirm that its Boeing identification number is "clearly visible". This is the narrow alley where the part was found:
A 9/11 Plane Part Has Been Found in New York City