Police said the man grabbed the 10-year-old's buttocks from behind then fled.
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Police described the attacker as a 45-year-old Hispanic man with salt-and-pepper hair who's approximately 5-foot-9 and weighs between 160 and 180 pounds. He was last seen wearing black jeans, a grey jacket and glasses.
Police released a photo of the man from the bus's surveillance video.
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