Flash mob of 400 teens shuts down Tinley Park carnival.

The annual Armed Forces Carnival in Tinley Park was shut down after a flash mob of 400 teenagers caused chaos, leading to the cancellation of the final day. The teens were brought together by social media and intended to cause mayhem. Police made five arrests and issued several citations. The final night of festivities was canceled after learning of another planned flash mob set for Sunday. No firearms were found at the scene, and there was only one minor injury reported.