By MICHAEL TARM, KATHLEEN FOODY and ROGER SCHNEIDER HIGHLAND PARK, Ill. (AP) — At least six people died and 24 were wounded in a shooting at a July Fourth parade in the Chicago suburb of Highland Park, and officers are searching for a suspect who likely fired on the festivities from a rooftop, police said Monday. Highland Park Police Commander Chris O’Neill, the incident commander on scene, urged people to shelter in place as authorities search for the suspect. Lake County Major Crime Task Force spokesman Christopher Covelli said at a news conference that the gunman apparently opened fire on parade-goers from a rooftop using a “high-powered rifle” that was recovered at the scene.