A tour bus traveling from Niagara Falls to New York City rolled over on I-90 near Pembroke, New York, killing five people and injuring many others. State police said 54 people were on board. Erie County Medical Center received 24 patients, while the University of Rochester Medical Center treated six, two of whom were critical. Two more patients at United Memorial Medical Center were treated and released. Authorities said most passengers were Indian, Chinese and Filipino nationals. The cause of the accident remains under investigation, with mechanical failure and impairment being ruled out, according to officials.