NEW YORK (WABC) -- Members of the FDNY and union leaders held an emergency rally in Manhattan on Monday afternoon over the discovery of previously undisclosed records about ground zero.

They are demanding answers after it was revealed that first responders were exposed to toxins on 9/11 that the city knew about but never shared.

Officials say 68 previously undisclosed boxes containing information on the 9/11 toxins were found after legislation was ordered demanding a probe into what and when the city knew about toxins at ground zero.

Union officials say the information in those documents contained critical "life-and-death" data.

Officials say the documents prove city leaders at the time of the attack were aware there was asbestos in the air, but intentionally hid the information.

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