Gunman fired more than 70 rounds at Chicago's July 4 parade: police

The gunman who attacked an Independence Day parade in suburban Chicago fired more than 70 rounds with an AR-15-style gun that killed at least six people, then evaded initial capture by dressing as a woman and blending into the fleeing crowd, police said Tuesday.

A spokesman for the Lake County Major Crime Task Force told a news conference that the suspected shooter, who was arrested late Monday, used a high-powered rifle “similar to an AR-15" to spray bullets from atop a commercial building into a crowd that had gathered for the parade in Highland Park, a close-knit community on the shores of Lake Michigan that has long drawn the rich and sometimes famous.

More than 30 people were wounded in the attack, which task force spokesman Christopher Covelli said the shooter planned for several weeks.

Investigators who have interrogated the suspect and reviewed his social media posts have not determined a motive for the attack or found any indication that he targeted anyone by race, religion or other protected status, Covelli said.

Authorities have not filed criminal charges.

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Earlier in the day, FBI agents peeked into trash cans and under picnic blankets as they searched for more evidence at the site where the assailant opened fire. The shots were initially mistaken for fireworks before hundreds of revellers fled in terror.

A day later, baby strollers, lawn chairs and other items left behind by panicked parade goers remained inside a wide police perimeter. Outside the police tape, some residents drove up to collect blankets and chairs they abandoned.