Monroe County Sheriff's deputies say one person was hurt in a pileup this morning on northbound I-390, in Rush, just north of the Livingston County Line.
It happened during a snow squall around 7:15 when a northbound tractor-trailer went out of control and hit six cars, then took off.
Four vehicles had to be towed and a woman had a minor injury.
Deputies are looking for the hit-and-run semi.