Alex Brandon, Associated Press
Protesters fall to the ground as New Orleans police lock a gate outside the New Orleans City Council chambers during a meeting Thursday about tearing down public housing buildings.

NEW ORLEANS — Despite protests that at times erupted in violence, the City Council voted unanimously Thursday in favor of demolishing some 4,500 public housing units as the city rebuilds from Hurricane Katrina.

The vote to permit the federal government to tear down four public housing developments — a critical moment in a protracted fight between the U.S. Department of Housing and Urban Development and residents, activists and preservationists — followed hours of debate and clashes in the street outside.

Police used chemical spray and stun guns as dozens of protesters tried to force their way into the packed City Council chamber. One woman was sprayed and dragged from the gates. Emergency workers took her away on a stretcher.

Another woman said she was stunned by officers, and still had what appeared to be a Taser wire hanging from her shirt.

"I was just standing, trying to get into my City Council meeting," said the woman, Kim Ellis, who was taken away in an ambulance.

"Is this what democracy looks like?" Bill Quigley, a Loyola University law professor who opposes demolition, said as he held a strand of Taser wire he said had been shot into another of the protesters.

Quigley said he believed the crackdown violated public meetings laws.

Protesters said they pushed against the iron gates that kept them out of the building because the Housing Authority of New Orleans had disproportionately allowed supporters of the demolition to pack the chambers.

After roughly 30 minutes of on-again-off-again struggle to get into the meeting, protesters fell back, continuously chanting with bullhorns. An afternoon storm thinned the demonstrators, some of whom had been waiting since 7 a.m. to enter.

At the peak of the confusion, some 70 protesters were facing about a dozen mounted police and 40 more law enforcement officers on foot.

Details on arrests were not immediately available.

The meeting itself was mostly peaceful, although an early fight in the chambers between protesters and police caused a brief interruption.

Some public housing residents repeated during the daylong debate that they welcome the plan to replace the decades-old structures with mixed-income housing.

Other residents and their advocates said they fear the plan will result in loss of badly needing housing for the city's low-income black residents.

The vote crossed racial lines, with the three black council members joining four whites.