Highland Park shooter's rooftop position made it difficult for officers to find him quickly as parade turned into chaos, police chief says

New details have emerged describing a scene filled with fear and chaos as a 21-year-old gunman opened fire during a Fourth of July parade in a Chicago suburb, where seven people were killed and dozens of others wounded.

source https://www.cnn.com/2022/07/08/us/highland-park-illinois-shooting-july-fourth-parade-friday/index.html