(MCT) — CHICAGO — Chicago police are questioning two persons of interest in the slaying of 15-year-old Hadiya Pendleton, a day after first lady Michelle Obama attended the funeral for the teenager whose death has become a symbol of escalating violence in Chicago, according to law enforcement sources.

The two men, one in his late teens and the other 20, were pulled over near East 67th Street and South Chicago Avenue late Saturday night or early Sunday morning after detectives canvassed the area of the park where Hadiya was shot and killed Jan. 29, and tracked down witnesses, the sources said. No charges have been filed.