The New York City officials who withheld 68 boxes containing air-quality data and other information about toxins at Ground Zero put the health and lives of first-responders and thousands of others in danger, officials from the FDNY’s largest union said Monday.

Uniformed Firefighters Association president Andrew Ansbro demanded to know who told his members and the public that the air quality was safe to return to lower Manhattan in the wake of the Sept. 11, 2001 attacks on the World Trade Center. He said the recently released documents could have helped public health officials diagnose and treat cancers and other diseases that have killed 400 New York City firefighters , in addition to the 343 who died on Sept. 11, 2001.

"We need to know who lied initially," Ansbro said at a news con

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