Customers fled an In-N-Out Burger location in Tempe, Arizona, when a brawl broke out July 13. (Antony Pile via Storyful)

A violent brawl inside an In-N-Out Burger restaurant in Arizona sent terrified customers running as a group of teenagers exchanged punches in the dining room.

The fight erupted at about 7 p.m. local time Monday at the beloved fast-food chain's Tempe location.

The Tempe Police Department told Fox News Digital that officers responded to the scene, but the people involved had already fled on foot and in vehicles.

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A July 13 brawl involving a group of young people at an In-n-Out Burger restaurant in Tempe, Arizona sent customer running for safety. (Getty Images; Antony Pile via Storyful)

Video captured inside the restaurant shows a group of teens throwing punches and tackling each other to the floor as customers scrambled to get out of the way.

The person who recorded the video noted that customers were "camping out" inside the restaurant at the time due to an active monsoon storm, affiliate FOX 10 Phoenix reported.

A brawl erupted Monday inside an Arizona In-n-Out Burger restaurant. (Antony Pile via Storyful)

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Investigators spoke with witnesses and staff, and a follow-up investigation is now underway.

The cause of the brawl has not been disclosed, and Fox News Digital has reached out to the California-based chain for comment.

The altercation closely mirrors a May brawl that happened inside a Chipotle restaurant in Washington, D.C.

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In that incident, teens dressed head-to-toe in black — some wearing hoods and masks — were seen throwing punches and hurling chairs as innocent bystanders sought safety.

Louis Casiano is a reporter for Fox News Digital. Story tips can be sent to louis.casiano@fox.com.

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