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An armed forces carnival was canceled by officials in a Chicago suburb after a flash mob of hundreds of teens caused chaos at the event

The Village of Tinley Park in Illinois announced that the final day of the Armed Forces Weekend Carnival scheduled for Sunday had been canceled "due to safety concerns stemming from a flash mob incident at Saturday’s event."

"Police said a group of about 400 teenagers who were responding to a call on social media to form a flash mob gathered at the carnival Saturday evening and began running through the parking lot and fighting with each other in an attempt to cause chaos and disrupt the event," Tinley Park government officials said in a statement.

A police officer was injured attempting to break up a fight and was treated at a local hospital before being released.