Advocates and officials are raising questions after the city confirmed it recently located 68 boxes of 9/11 toxin-related documents.

Last Tuesday, they were able to start looking inside some of the boxes.

Now they wait as the Department of Environmental Protection scans the documents they’ve vetted so they can begin to learn what exactly was in the air in the days and months after the Sept. 11 attacks.

“How could this happen, and who was behind it? Was it intentional misconduct or just incompetence?” General Counsel of the FDNY Uniformed Firefirefighters Association Thomas McManus said.

Advocates say they’ve been requesting the documents for years from the department.

“Twenty four years ago, they made the choice to hide the evidence of what happened [on] 9/11,” FDNY UFA President Andr

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