Chaos broke out at a massive “6-7” event that attracted hundreds of kids and teens, ending in fights and arrests, according to authorities.

A Sky Zone in Shrewsbury, Missouri, held what was meant to be a family-friendly event on Sunday to celebrate the “6-7” internet meme.

But chaos erupted outside the Sky Zone as 300 to 350 unaccompanied kids and teens were waiting in line after the indoor trampoline park reached capacity, according to authorities.

“With temperatures around 90 degrees, it did not take long for tempers to flare,” the Shrewsbury Police Department said in a press release.

Within minutes, at least eight fights broke out, according to authorities. Shrewsbury Police noted that Sky Zone ”had not arranged for additional security despite the anticipated large crowd.”

As officers arrived outside the Sky Zone on Sunday afternoon, the minors, aged 10 to 17, scattered and entered nearby businesses, including Aldi and Walmart.

Those who entered the nearby businesses caused damage and threatened customers and employees, according to authorities.

Shrewsbury Police said they requested backup from other agencies “due to the size and volatility of the crowd.”

As authorities tried to control the crowd, the minors “ turned their aggression toward the officers and began yelling obscenities, making threats, throwing rocks, and refusing to leave the area,” the press release said.

A 12-year-old girl in the crowd had allegedly brought a butcher knife, which authorities took.

She told authorities that she took a car from the rideshare company Uber to the area from nearby Florissant because she wanted to get involved in the fights she saw on social media, Shrewsbury Police said.

The girl allegedly said she brought the knife “for protection.”

Several minors were detained and later released to their parents, according to authorities. The crowd gradually broke up, and the area was cleared by Sunday night.

Police reported no known injuries among officers or the crowd.

The Shrewsbury Sky Zone thanked everyone who followed the rules during its “6-7” event and apologized to those who couldn’t celebrate with them.

The term “6-7” comes from rapper Skrilla’s song “Doot Doot (6 7),” frequently used in viral videos featuring NBA player LaMelo Ball, who is 6 feet and 7 inches tall, according to Merriam-Webster.

It’s a nonsensical expression often blurted out when someone else says the numbers six and seven together. The phrase, usually used among kids and teens, is often accompanied by a juggling hand gesture.

“We are SO SORRY to the families we were unable to accommodate before we reached the safety capacity,” the trampoline park said in a statement on Facebook. “The turnout was incredible, and unfortunately we sold out before we could get everyone in.”

The Shrewsbury Sky Zone requires guests 17 and younger to be accompanied by a parent or supervising adult 25 or older. The trampoline park said its rules are “not optional.”

“The requirement for teens to have a parent or guardian present was clearly communicated and was enforced consistently for everyone’s safety.

“While there was plenty of chaos outside, inside Sky Zone was running like a well-oiled machine thanks to our incredible team,” the Shrewsbury team said.