The NYPD says the airplane debris found in a lower Manhattan alley came from the wing of a Boeing 767 believed to have hit the World Trade Center towers on September 11, 2001.

Boeing 767 trailing edge flap (NYPD)

The piece is identified as a trailing edge flap actuation support structure but the Boeing investigator could not determine from which plane the piece is from.

The NYPD plans to remove the piece from the alley behind 51 Park Place on Wednesday after the Chief Medical Examiner sifts soil at the location for human remains.

Paul Browne, chief spokesman for the New York Police Department told WABC TV the rope found with the debris may have come from a broken pulley that came off the roof of the Islamic community center. He does not believe the part was planted.

Workers discovered the landing gear part Wednesday wedged between a luxury apartment building and a mosque that in 2010 prompted virulent national debate about Islam and freedom of speech because it’s just blocks from ground zero.

The New York Post reports that the number on the debris, BOEING CST 65B84045, is likely just a casting number and cannot be traced back to a specific airplane.