ABC NEWS -- New York City's police union is demanding more information about the effects of toxic debris from the 9/11 attacks.

The Patrolmen's Benevolent Association called on the city to release all data about officers who suffered cancer after responding at the World Trade Center at a news conference on Sunday.

The union also showed the uniform worn that day by Officer Alonzo Harris.

It was tested and found to have dangerous carcinogens on it.

The P.B.A. says the city has dragged its feet on providing information about first responders.

"It's unconscionable that they would not release this data. This is an issue of men and women who serve this city without question and they're looking for one thing, they're looking for the treatment that they deserve," P.B.A. President Patrick Lynch said.

The union wants cancer included on the list of illnesses covered by the Zadroga Act, to help first responders.

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