VIDEO: Police Supporters Clash with Black Lives Matter Activists Near Site of Fatal Chicago OIS

Pro-police and anti-police protesters clashed Sunday afternoon near the site of an officer-involved shooting that killed a 25-year-old man in Chicago's Mount Greenwood neighborhood.

Investigators said Joshua Beal, of Indianapolis, was armed when a confrontation between him and officers resulted in him being fatally shot Saturday.

On Sunday, Mount Greenwood residents squared off against activists demonstrating against the shooting. The clash between Black Lives Matters and Blue Lives Matters groups became tense at times as they exchanged chants such as "KKK" on one side and "CPD" on the other side.

According to police, the shooting occurred after a vehicle leaving funeral services at a nearby cemetery stopped in traffic in front of a Chicago fire house near West 111th Street and South Troy Street. An off-duty firefighter told the driver that they were illegally blocking the fire lane. The occupants exited the vehicle and a verbal/physical altercation ensured, police said. An off-duty Chicago police officer was inside a nearby business and assisted the firefighter.

A Chicago police sergeant driving to work stopped when he observed a man with a firearm in his hands. After the man "failed to drop his weapon, shots were fired striking the individual multiple times," police said.

Family members dispute the police narrative.

Michael Beal, Joshua Beal's brother, was charged with aggravated battery to a police officer, resisting arrest and attempting to disarm a police officer, a Cook County State's Attorney spokesperson said Monday. He is scheduled to appear in court at 1:30 p.m. Tuesday, ABC 7 reports.