The death toll from the Independence Day shooting in Highland Park, Illinois, has risen to seven, police said Tuesday, as they worked to find a motive for the attack and weigh charges against the 21-year-old suspect.

Police crime tape is seen near American flag-themed sunglasses laying on the ground at the scene of the Fourth of July parade shooting.

Police crime tape is seen near American flag-themed sunglasses laying on the ground at the scene of a shooting. The photo was taken by Young Rae Kim.

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Sgt. Christopher Covelli of the Lake County Major Crimes Task Force said that more than 30 people were injured in the attack.

A 78-year-old grandfather who didn't want to attend the parade was one of the people who died in the shooting.

According to Covelli, charges will likely be announced Tuesday afternoon.

Covelli said during a press conference on Tuesday that Crimo scaled a fire escape to gain access to a rooftop and then opened fire on the crowd below. Police say Crimo, who wore women's clothing to hide his facial tattoos and identity, fired more than 70 rounds before he fled the scene. He borrowed his mother's Honda Fit after the shooting. After an hours-long search, officers spotted the Honda in a nearby suburb and attempted to stop it, but they were unable to do so due to a lack of manpower. The music videos on Awake depicted violent images of mass murders and school shootings. Nancy Rotering, the mayor of Highland Park, told the Today show that she didn't think he was known to police.

What We Don’t Know

The shooting appeared to be random, but investigators have not yet determined a movie for the attack. The attack was not based on race or religion, he said.

Police say what they know about the suspect in the July 4th shooting.