Cobb County police have arrested two teens, including a Six Flags Over Georgia employee, in the beating last week of a Marietta teenager just outside the amusement park.

Police viewed park video as part of their investigation and expect to make more arrests.

“We got your names. If we don’t have them, we will have them,” Cobb Public Safety Director Mickey Lloyd said on Tuesday. “This camaraderie ‘one for all and all for one’ on the street doesn’t hold water when somebody is sitting in police custody by themselves being questioned. They are going to tell who you are.”

Police believe the other assailants ”all believed to be young” live in west and south Atlanta.

As many as 25 people were involved in the July 3 beating or know who was involved, said Maj. Paula Sparks, head of the Crimes Against Persons Unit. Police arrested Brad M. Johnson, 18, on Monday at his home in Atlanta.

Christy Poore, manager of public relations for Six Flags, confirmed that Johnson worked at the park in southwest Cobb County.

Poore said Johnson “is a season employee, and I can’t go into more specifics because this is an investigation. I can say he was not on duty the day of the incident.”