It is not immediately clear if Rittenhouse, who is White, appeared in the video.
Following the incident, protests erupted in Kenosha and several other cities across the U.S., with Wisconsin Governor Tony Evers declaring a state of emergency on Tuesday and ordering additional Wisconsin National Guard troops to support local law enforcement. "At this time, we have not found evidence on Facebook that suggests the shooter followed the Kenosha Guard Page or that he was invited on the Event Page they organized".
Democratic Wisconsin Governor Tony Evers, who had already declared an emergency over the unrest, said he had authorized the deployment of 500 members of the National Guard. The company said it also is in the process of removing other accounts and material tied to the shootings that violate its policies, such as for glorifying violence, and it is in contact with local and federal law enforcement on the matter.
At the Republican National Convention on Wednesday, U.S. Vice President Mike Pence described the November 3 election between President Donald Trump and Democratic challenger Joe Biden as a choice between "law and order" and lawlessness. "The violence must be stopped".
The city has been the centre of protests following the death of George Floyd, a 46-year-old African American man, who died in May after a police officer knelt on his neck for almost nine minutes.
Social media videos show crowds in Kenosha chasing the gunman down the street after they believed he had shot another man. The man stumbles to the ground is attacked before he starts firing his weapon several times, killing another man and wounding a third.
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America's National Basketball Association (NBA) cancelled all three playoff games after the Milwaukee Bucks boycotted their game in protest against Blake's shooting.
The Wisconsin Department of Justice Division of Criminal Investigation released the details on Wednesday after two nights of violent protests, rioting and looting in Kenosha and other cities. State agents later recovered a knife from the driver's side floorboard of the vehicle, the department said.
Blake's family has called for the officers involved in the incident that has left Blake paralyzed from the waist down to be terminated from the police force and for the officer who shot him to be charged with attempted murder.
A lawyer for Blake's family, civil rights attorney Ben Crump, has said Blake had been attempting to break up a quarrel between two women when he was confronted by police and that there was no indication he was armed when shot.
Authorities said Sheskey was among officers who responded to a domestic dispute, though they have not said whether Blake was part of the dispute.
"I'm not going to address that because it is one snippet of a very large situation and much of what's happened across this nation for a long period of time, it's focused on what you see in this much of an incident", Miskinis said. "We need to understand that when most of us go home, we still are Black".