Bria Swenson holds a sign in Oakland, California, following the acquittal of Kyle Rittenhouse in Kenosha, Wisconsin. AP

A jury acquitted teenager Kyle Rittenhouse on Friday of murder in the fatal shooting of two men during racial justice protests in a decision that re-ignited fierce debate about gun rights and the boundaries of self defense in the United States.

For many Black Americans, Kyle Rittenhouse's acquittal of all charges by a Wisconsin jury on Friday confirmed their belief in two justice systems: one for white people and another for Black people.

Activists have previously pointed to differences in how police handled Rittenhouse's case and that of Jacob Blake, the Black man who was shot by a white Kenosha police officer in August 2020, sparking protests in the city that became destructive and violent.

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Video footage played during the trial showed Rittenhouse running toward police still wearing his rifle, and continuing past the police line at officers' direction. He turned himself in to police in Antioch, Illinois, early the following day.

Rittenhouse, 18, began to choke up, fell forward toward the defence table and then hugged one of his attorneys as he heard a court clerk recite "not guilty” five times. A sheriff’s deputy whisked him out a back door.

Kyle Rittenhouse walks during his trial at the Kenosha County Courthouse in Kenosha, Wisconsin. Reuters

"He wants to get on with his life,” defence attorney Mark Richards said. "He has a huge sense of relief for what the jury did to him today. He wishes none of this ever happened. But as he said when he testified, he did not start this.”

Jurors found Rittenhouse, 18, not guilty on all charges: two counts of homicide, one count of attempted homicide for wounding a third man, and two counts of recklessly endangering safety in protests marred by arson, rioting and looting on Aug. 25, 2020 in Kenosha, Wisconsin.

Rittenhouse broke down sobbing after the verdict and collapsed to the floor before being helped back into his chair, his hands shaking. His mother also wept.

Amid a heavy law enforcement presence, several dozen protesters lined the steps outside the courthouse after the verdict was read, some carrying placards in support of Rittenhouse and others expressing disappointment. By early evening, the crowd had thinned to a handful of people and there was no sign of disturbances in the city.

"We are all so very happy that Kyle can live his life as a free and innocent man, but in this whole situation there are no winners, there are two people who lost their lives and that's not lost on us at all," David Hancock, a spokesperson for the Rittenhouse family, told Reuters.

Rittenhouse shot and killed Joseph Rosenbaum, 36, and Anthony Huber, 26, and fired a bullet that tore a chunk off the arm of Gaige Grosskreutz, 28. Rittenhouse claimed self defence.

A demonstrator holds a sign in Oakland, California, following the acquittal of Kyle Rittenhouse in Kenosha. AP

US President Joe Biden, who during last year's election campaign tweeted a video that appeared to link Rittenhouse to white supremacists, said on Friday he supported the jury's decision and urged Americans to react with calm.

"While the verdict in Kenosha will leave many Americans feeling angry and concerned, myself included, we must acknowledge that the jury has spoken," Biden said.

Rittenhouse, who testified that he had no choice but to open fire to protect himself, is viewed as heroic by some pro-gun conservatives who consider the shootings justified. Many on the left view Rittenhouse as a vigilante and an embodiment of an out-of-control American gun culture.

Protests against racism and police brutality turned violent in many US cities after the police killing of Black man George Floyd in Minneapolis three months before the Kenosha shootings.

The Rittenhouse verdict ended the highest-profile US civilian self-defense case since a man named George Zimmerman was acquitted in the fatal shooting of Trayvon Martin, an unarmed Black teenager, in Florida in 2013.

With so much of that night in Kenosha caught on cellphone and surveillance video, few basic facts were in dispute. The trial instead focused on whether Rittenhouse acted reasonably to prevent "imminent death or great bodily harm," the requirement for using deadly force under Wisconsin law.

The prosecution, led by Kenosha County Assistant District Attorney Thomas Binger, sought to paint Rittenhouse as the aggressor and repeatedly stressed that he was the only one to kill anyone that night.