ACWORTH, Ga. — Two females who police said might be as young as 16 were clad in sunglasses as they handed a bank teller a note demanding cash, smiled as they waited and walked out with an undisclosed amount of money Tuesday, police said.

"This is something totally new to us," Cobb County police spokesman officer Wayne Delk said of the robbery at a Bank of America branch inside a grocery store.

The girls approached the teller inside the Kroger store shortly after noon, and witnesses were unable to tell investigators whether they

left in a car.

Their only disguise was the sunglasses, and they were clearly pictured in surveillance camera shots.

"The pictures are too good. Someone's got to know them," Delk said.

Heather Johnston and Ashley Miller, both 19, were videotaped wearing sunglasses and laughing during the Tuesday robbery of a Bank of America in Acworth, a well-to-do suburb in neighboring Cobb County, about 30 miles north of Atlanta.

Police also arrested a bank teller, saying the heis

t appeared to be an inside job.