There have been clashes for a second night in Wisconsin, with buildings and cars set alight, following the police shooting of a black man on Sunday.
Jacob Blake, 29, is in a stable condition after he was shot several times as he went to a car and opened its door in the city of Kenosha.
Governor Tony Evers has called up the National Guard to aid local police.
The killing of black man George Floyd in Minnesota in May led to protests against racism and police brutality.
Demonstrations across the US and in many cities internationally put a spotlight on the treatment of African-Americans by US law enforcement and prompted a wider reflection on racism in society.
Kenosha Police Department said the “officer involved shooting” happened shortly after 17:00 on Sunday. It added that officers had provided “immediate aid” to Mr Blake, who was taken to a hospital in Milwaukee in serious condition.
In the video footage, three officers can be seen pointing their weapons at a man identified as Mr Blake as he walks around a parked SUV.
As he opens the door and leans into the car, one officer can be seen grabbing his shirt and opening fire. Seven shots can be heard in the video, as witnesses shout and scream.
The police said officers had been responding to a “domestic incident” but gave no details about what led to the shooting. It is so far unclear who called police and what happened before the video recording began.
Police in Kenosha do not have body cameras, although they do have microphones.
Mr Blake’s partner, Laquisha Booker, told a local NBC channel that the couple’s three children were in the back of the vehicle at the time and saw the shooting.
Civil rights lawyer Ben Crump, who represents the families of George Floyd and others pursuing actions against the police, has announced he is representing Mr Blake’s family.he said in his twitter handle the 29-year-old father “was helping to de-escalate a domestic incident” at the time.
Mr Crump said the officers’ “irresponsible, reckless and inhumane actions nearly cost the life of a man who was simply trying to do the right thing”.
Mr Blake, who works as a security guard, is now out of surgery and improving.
Wisconsin’s Department of Justice is investigating the incident in Kenosha, a city of about 100,000 on the south-western shore of Lake Michigan.
The officers involved have been placed on administrative leave and a petition calling for them to be charged has garnered tens of thousands of signatures.
The Kenosha County district attorney said his office would work as quickly as possible but “these kinds of huge decisions… are not decisions that can be made in haste”.
Democratic presidential nominee Joe Biden on Monday released a statement calling for a “full and transparent investigation” of the shooting.