A war has erupted between the Bloomberg administration and its rank-and-file unions over the rate of cancer among cops who worked at Ground Zero.

An official for the Patrolmen’s Benevolent Association yesterday criticized the city for failing to accumulate data on cancer among cops who worked at the World Trade Center site.

“The City of New York has done nothing to facilitate any cancer study and has been actively working to prevent a comprehensive examination of the issue,” PBA Research Director Frank Tramontano said at a City Council hearing yesterday. The NYPD declined an invitation.