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Ten teenagers and one adult are under arrest after a brutal mob attack at a Memphis grocery store.

And at least one witness said the teens appeared to be playing the so-called "knockout game," CBS News correspondent Don Dahler reports.

It's unclear if this was gang-related or had to do with the knockout game, or both, but the violent game has become increasingly popular around the country. The goal: to hit unsuspecting strangers and knock them out with a single punch.

According to police, the mob started beating a customer as he got out of his car in the store's parking lot.

Investigators say that when two employees came to help, the teens attacked, kicking them until they lost consciousness.

A witness said some of the kids threw pumpkins at one of the unconscious victims.

"It didn't seem real," a witness said. "It didn't seem like any of that would happen."

The witness, who asked not to be identified, said this was part of a violent game.

"They were playing a game called 'point them out, knock them out' where they would point someone out and attempt to knock them out or fight them. There was no real reason behind it," the witness said.

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Three injured in knockout game in Memphis - CBS News