At least 15 people were shot, two of them fatally, inside a “pop-up party” early Sunday at a business that operates as a tow company and apparent event space on the South Side, Chicago police Superintendent David Brown said. Investigators believe the 4:40 a.m. shooting was “gang-related,” according to a Chicago police report citing preliminary information. Officers and firefighters responded to a business at 6798 S. South Chicago Ave. in the Park Manor neighborhood, according to police and fire officials. The report says a woman who was shot three times, including once in the head, was found dead outside the...