Rooftop shooter kills 6 at July 4 parade in Highland Park

STORY: Police said they were searching for a white male about 18 to 20 years old and asked the public for tips and cellphone images and surveillance video to help find him.

The shooting comes with gun violence fresh on the minds of many Americans, after a massacre on May 24 killed 19 school children and two teachers at an elementary school in Uvalde, Texas, and the May 14 attack that killed 10 people at a grocery store in Buffalo, New York.