Earlier this month, the Department of Investigation said the overhaul of the city 911 system had been mismanaged, but in a hearing Wednesday, the leader of that agency came under fire from a city councilwoman. NY1's Bobby Cuza filed the following report.

It was a blistering report: Mark Peters, commissioner of the city’s Department of Investigation, said the Bloomberg administration mismanaged the city’s 911 overhaul, a still-unfinished project that’s running 10 years behind schedule and about $700 million over budget. 

But the report didn’t go far enough for City Councilwoman Elizabeth Crowley, who opposes unifying the 911 operations of police, fire and EMS. Her aggressive line of questioning Wednesday led to tension.

    Peters: The system as a whole is more reliable now than it was     15 years ago, although there are clearly problems, which were laid     out in the report.

     *Crowley interrupts*

    Peters: If I could finish my sentence, Councilmember. Thank you.

After some more sparring, Crowley asked other city agency officials to join Peters. He resisted, prompting another exchange

"It seems to appear to us here at the Council, certainly to myself, is that you’re trying to hide something," Crowley said.

"Councilmember, you've just made a fairly serious accusation," Peters responded, adding, "If that accusation is accurate, then you're also accusing me at the moment of could a felony, so I would appreciate it if you would either dial down your rhetoric and withdraw the accusation of a felony, or I would like written evidence of that within the next 24 hours."

Afterwards, Crowley maintained that Peters' report mostly rehashed other reports over the years.

"The commissioner didn't ask critical questions," Crowley said. "He talked about cost overruns, he gave percentages. He could not back them up with real numbers. That’s why we have a fact-finding hearing such as what we had today, to get at those numbers. He did not come prepared."

Meanwhile, as the project moves forward, the Department of Investigation is implementing one of the recommendations in its report. Peters said Wednesday that the agency will issue a request for proposals by the end of next week for an independent integrity monitor that will provide oversight on the project moving forward.