Five people were killed and many were injured when a tour bus returning to New York City from Niagara Falls with 54 people on board crashed and rolled on its side on an interstate highway, authorities said.

A police spokesman said the bus left the road on a highway about 40km (25 miles) east of the northern city of Buffalo on Friday.

An investigation into the cause of the crash is under way but police said they suspect the driver, who survived, became distracted, lost control of the vehicle at “full speed”, and oversteered, causing the bus to flip over and come to a rest in a ditch.

Authorities have ruled out mechanical failure and driver health issues, and said no other vehicles were involved.

According to police, bus passengers were from China, India, the Middle East, the Philippines

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