Hundreds of teenagers flood into downtown Chicago, smashing car windows.

Hundreds of teenagers flooded into Downtown Chicago on Saturday night, smashing car windows, trying to get into Millennium Park, and prompting a major police response. A woman whose car was smashed by people jumping on the windshield said her husband was beaten as he sat in the driver's seat. Police were escorting tourists and others back to their cars in the Millennium Park garage.

The gathering may have occurred because of social media postings, according to CPD.