A violent fight erupted at the Rock 'n' Roll McDonald's in Chicago's River North neighborhood, and the whole thing was captured on cell phone video.
The recording, only about 30 seconds in length, was originally sent to WGN by a viewer.
It shows a group of men violently beating another man with aluminum chairs before escaping out of a side door.
The video was later posted on social media -- quickly grabbing the attention of thousands of people across the country.
Chicago Police say the fight broke out early Saturday morning at the prominent McDonald's restaurant in the 600 block of North Clark Street -- an area very popular to tourists.
Officers say they responded to the disturbance at about 1 a.m. Saturday, but by the time they arrived, everyone involved had fled.
No injuries were reported, however, the restaurant did file a criminal damage report for glass that was broken during the altercation.
Authorities say the video surveillance will not be reviewed and there will be no further investigating because no injuries were reported and because the restaurant only sustained minor property damage.
Police say the fight does not appear to be related to the fight that happened earlier Friday at Navy Pier involving at least 30 people.
Five people were arrested in that incident.
A pregnant woman was also taken to the hospital for non-life threatening injuries after the outbreak at Navy Pier.