The girl claims the man followed her into a bathroom stall and groped her. There were no witnesses to the attack.
Police believe the he walked into the bathroom either just before or at the same time as the girl. She was not injured.
It's not clear how the man was able to go into the women's restroom undetected.
The girl told police that the man was white and in his forties. He was reportedly wearing black frame glasses, a black puffy coat with a gray shirt and orange pants with white stripes on the side which were tucked into a dark pair of shoes.