A clerk was attacked by some in a crowd of about 50 people involved in robbing a 7-Eleven store in Anaheim early Sunday.

Two masked men initially attacked the clerk, around 1:30 a.m., trying to break through the door of the store at 550 S. Knott Ave., near Orange Avenue.

A suspect in a gray hoodie carrying what appeared to be a large rock threatened the clerk to back away from the door, opening the opportunity for the mob members to enter.

Officers were initially en route to a call regarding a street takeover at Knott, when police received a call about the robbery.

Delayed by the traffic from the street show, officers arrived after the suspects had fled.

Several men ransacked the store, climbed onto counters, pushed shelves and threw merchandise. Video also shows the crowd leaving with stolen items.

Some members were seen filming the assault-robbery and laughing at the clerk with a bloodied face.

The clerk sustained minor injuries with a bleeding nose, Anaheim Sgt. Matt Sutter said.

An undisclosed amount of cash was also stolen from the registers.

The robbery follows a series of flash-mob-style robberies targeting 7-Eleven convenience stores across Southern California.

Anyone with information regarding the case was asked to anonymously contact Orange County Crime Stoppers at 855-847-6227 or at occrimestoppers.org.