Updated

Police say the alley near the World Trade Center where landing gear believed to be from a Sept. 11 hijacked plane was found remains a crime scene until medical examiners finish looking for human remains.

On Saturday, police were guarding the alley, which was secured as a crime scene two blocks from the trade center site. Police say it will be protected until the search is completed.

Workers this week discovered a rusted piece of landing gear wedged between a luxury apartment building and a mosque that had prompted virulent national debate about Islam and freedom of speech.

Police spokesman Paul Browne says the twisted metal part includes a Boeing identification number.

The two planes hijacked by terrorists in 2001 were made by Boeing.