A person of interest has been identified in Monday’s deadly mass shooting at a Fourth of July parade outside Chicago, authorities said.

Officials said he was 22-year-old Robert “Bobby” E. Crimo III and is believed to be driving a 2010 silver Honda Fit.

According to the New York Post, the gunman opened fire with a “high-powered rifle” while standing on a roof just minutes after the parade began in the tony suburb of Highland Park, where six people were left dead and 24 others injured.

The killer “was very military-style, methodical in the way he was crouched and shooting,” an attendee told WGN TV.

Police said cops ran toward the gunfire but that the shooter had ceased firing before they arrived.

Illinois Gov. JB Pritzker pledged additional resources in the wake of the violence.

“State police are on the scene and we have made all state resources available to the community,” he tweeted. “We will continue working with local officials to help those affected.”