Officials called this a "serious mass casualty" accident near Pembroke, New York, involving a bus traveling from Niagara Falls to New York City on the New York Thruway.

"Avoid the NYS Thruway eastbound at all costs as a tour bus has rolled over near the Erie and Genesee County lines," Erie County executive Mark Poloncarz said on X. "This is a potential mass casualty incident," he said, adding that the county's emergency and security services are assisting.