Tornadoes touch down in Chicago area, grounding flights and wrecking homes

Tornadoes in the Chicago area delayed hundreds of flights and forced thousands of people to take shelter overnight. 

Twisters were seen near the city's O'Hare International Airport, sending travelers in multiple terminals searching for cover. Flights there and at Midway International Airport were grounded for about 45 minutes. 

Another tornado touched down in Campton Hills, Illinois, which was also soaked with zero-visibility rain.