Protesters demonstrate against the death of George Floyd outside the 3rd Precinct Police Precinct on May 26, in Minneapolis, Minnesota, the US. Photo: AFP

Police officers who handcuffed and pepper-sprayed a 9-year-old girl in the US city of Rochester were suspended Monday at the mayor's request.

"What happened Friday was simply horrible, and has rightly outraged, all of our community," said Mayor Lovely Warren. 

Warren did not specify how many officers were suspended. The suspension will last at least until the conclusion of an internal investigation by the Rochester police.

Footage released Sunday, which has sparked new outrage over excesses committed by the country's law enforcement, showed at least seven officers were involved in the incident Friday.

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 eventually 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 2020 killing of George Floyd, sparked a summer of protests across the US against racial injustice and police brutality in 2020.

The ethnicity of the young girl in the Rochester incident has not been disclosed.

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

Body cam footage initially shows officers attempting to provide assistance to the girl. When her mother arrives, the pair argue and the officers decide to transport the increasingly distressed child to hospital. 

AFP