April 30, 2013 11:20 am Raw: Robot Investigates Suspicious Object on Michigan Avenue A robot investigates an object found taped to a flag pole Tuesday morning near the Wrigley Building. Police closed Michigan Avenue from Wacker to Ohio during the investigation. Local 2:25 Chicago's Forecast: Thursday Gets Off to a Foggy Start 2:27 Chicago's Forecast: Wintry Mix into Monday Morning 2:24 CHICAGO FORECAST: Not As Cold Sunday 2:00 Chicago Forecast: Cold weekend before a warm week ahead 2:21 CHICAGO FORECAST: Lake Effect Snow For Some