The girl was hit around 11:15 a.m. Friday by the bus near Acres Road, New York State Police said.
After the bus stopped to let several children off, Leah Mezzi of Brooklyn exited the bus and proceeded to a south sidewalk and abruptly changed directions and began to cross the street in front of the bus, state police said.
The bus driver did not see her change directions and she was subsequently struck by the front bumper and was pronounced deceased at the scene, according to police.
An investigation of the accident is continuing.
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