New details on 17-year-old arrested after allegedly killing 2 in Kenosha

Kyle Rittenhouse was taken into custody on suspicion of first-degree intentional homicide in the Tuesday shooting, some of which was captured on cellphone video.
2:55 | 08/28/20

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Transcript for New details on 17-year-old arrested after allegedly killing 2 in Kenosha
evening. The shooting of Jacob Blake in Wisconsin. Authorities tonight have now revealed the name of the officer and new details about what they say they found at the scene. We're also learning more tonight about the 17-year-old from a neighboring state now accused of opening fire on protesters. Two were killed. Tonight, what he said in an interview just moments before the shooting started. ABC's Alex Perez in Kenosha again tonight. Reporter: Tonight, new details on the teenager investigators say showed up in Kenosha armed with a rifle and allegedly opened fire on demonstrators protesting the police shooting of Jacob Blake. Authorities arrested 17-year-old Kyle Rittenhouse in nearby Illinois for his alleged role in Tuesday's shooting that left two dead and one injured. Police identified him as the man seen in this social media video during protests that night. So you guys are full-on ready to defend the property? Yes, we are. Reporter: This graphic video capturing the chaos. A crowd appears to be chasing the armed man when he falls to the ground and starts firing. As police approach the scene, Rittenhouse can be seen with his hands up, but he's never taken into custody. When someone -- I've been in a shooting before -- in situations that are high stress, you have such an incredible tunnel vision. Reporter: But some raising questions about that moment in light of Jacob Blake's shooting and insensitive comments made by the Kenosha sheriff in 2018, after five black people were arrested after allegedly stealing and causing a collision. The sheriff saying, "There are some people that aren't worth saving." He later apologized. Late today, Kenosha police saying they arrested nine people for alleged disorderly conduct after apprehending three vehicles with out of state plates that were filled with gas masks, illegal fireworks and suspected controlled substances. Authorities also releasing new information in the shooting Sunday of 29-year-old Jacob lake. Authorities now identifying the officer seen in that disturbing video as Rusten Sheskey. When Blake appearing to lean into the driver's side, Sheskey pulls his shirt and unloads seven bullets in his back. Authorities say they were called because a woman claimed her boyfriend, who wasn't supposed to be there, was on the premises. Authorities have not said Blake was that person. Investigators also say Blake told the officers he had a knife. Authorities say that knife was found on the floor inside his car. A federal civil rights investigation has now been opened into Blake's shooting, which is still under investigation. Sheskey and two officers now on administrative leave. So, let's get to Alex Perez, with us tonight. And Alex, this teenager now accused is set to appear in court tomorrow for an extradition hearing? Reporter: Well, David, we just learned the 17-year-old has been officially charged with two counts of homicide and one count of attempted homicide. That extradition hearing to bring him from Illinois back here to Wisconsin is set for tomorrow morning. David?

This transcript has been automatically generated and may not be 100% accurate.

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