Authorities have identified Robert ‘Bobby’ Crimo III, a Chicago-area rapper, as a person of interest in the Fourth of July Highland Park parade shooting, that injured at least 16 people and killed six.

Crimo, who was driving a 2010 silver Honda Fit, was recognized by a North Chicago police who initiated a traffic check, according to authorities. Crimo led cops on a brief pursuit before being apprehended. He was arrested.

Also read: Highland Park shooting suspect Robert ‘Bobby’ Crimo’s rap video features gun violence

Lake County Sheriff Sgt. Christopher Covelli had earlier told the press that the Highland Park parade shooting was carried out with a “high-powered rifle.” According to Cmdr. Chris O’Neill, handgun evidence was discovered on the rooftop of “a nearby business that was secured.”

“It looks like access to the roof via a ladder in an alley was unsecure,” Covelli also mentioned that the ladder was affixed to the structure.

Also read: Highland Park July 4 parade shooting: What we know so far

A Twitter user shared a video that Crimo is said to have just released. It has a voiceover that says, “I know what I have to do, not only for me but for everyone else.” The user brought up the obscure nature of the words. Soft vocals or fast-paced rap with a LoFi or trap beat describe the music of the alleged gunman.

One of his music videos, for the song “Toy Soldier,” shows a man firing a long gun at people and then lying face-down in a pool of blood after being shot by police. “I just want to scream/F*ck this world/Livin’ the dream,” the associated lyric runs.

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Crimo’s Facebook and Instagram accounts appear to have been deactivated after the police designated him as a “person of interest.” However, following the shooting, a Twitter user uploaded his last post on his Facebook page, which drew comments.

“You’re all sinners,” the rapper had remarked.