Investigators piece together clues in Highland Park, Illinois parade shooting

Investigators are learning new details about Monday’s mass shooting that killed six people and injured dozens at the Fourth of July parade in Highland Park, Illinois. A 21-year-old man is in custody, but police say they still don’t know the motive. CBS New reporter Chris Van Cleef explains how investigators were able to track him down, and CBS News Homeland Security and Justice reporter Nicole Sjanja explains what’s next in the investigation.