On Monday, a shooter armed with a high-powered rifle fired into a crowd of people attending the Fourth of July parade in Highland Park, Illinois, a suburb of Chicago. The shooter killed six people and wounded at least 38 others, according to authorities, and was at large for several hours before police finally took a suspect into custody.
The tragedy was not the only shooting to take place during the holiday weekend, but it was perhaps the most disturbing. The person of interest in the case, a 22-year-old, has an extensive history of engaging with and posting troubling extremist content.
