A nine-year-old Black girl was handcuffed and pepper-sprayed by police in the US city of Rochester, footage released Sunday showed, sparking new outrage over excesses committed by the country's law enforcement.

Deputy Police Chief Andre Anderson said Sunday the girl -- who has not been named -- had been suffering from a serious mental health emergency, reportedly threatening to take her own life and that of her mother.

Officers called to the scene on Friday responded by handcuffing her, before trying to force her into a car and pepper-spraying her when she resisted, body cam videos released by the city's police force showed.

Footage of police violence against African-Americans, including the May killing of George Floyd, sparked a summer of protests across the US against racial injustice and police brutality last year.

Rochester police on Saturday claimed they were "required" to use handcuffs and the irritant against the girl for her own safety.

Mayor Lovely Warren condemned their use of force against a child, pledging an internal review of the city's law enforcement practices.

"It is clear from the video that we need to do more supporting our children and families," she said at a press conference Sunday. "I have a 10-year-old child, so she's a child, she's a baby," she added. "This video, as a mother, is not anything you want to see. We have to understand compassion, empathy."

https://www.youtube.com/watch?v=M16D0Pn6Raw

The incident is the second time in a year that Rochester has come under national scrutiny for police violence against African-Americans, following the killing last March of Daniel Prude, who died after police hooded and forced him face down on the road.

The death of Prude, who was also undergoing a mental health crisis at the time of his detention, prompted a grand jury probe and sparked mass protests.

Rochester city council members condemned the footage, accusing the police of excessive force in a situation where mental health professionals should have been involved.

Local police chief Cynthia Herriott-Sullivan also acknowledged that the police had acted excessively.

"I'm not going to stand here and tell you that for a 9-year-old to have to be pepper-sprayed is OK," she said Sunday. "It's not."

But the local police union president defended the officers' actions, saying that "limited resources" had left them no choice but to use pepper-spray against the child.

"This is not about lack of compassion or empathy," Mike Mazzeo said Sunday. "We're dealing with a very difficult situation."

"It's not TV, it's not Hollywood. We don't just have a simple put someone in handcuffs and have them comply," he said.