Police look for clues in deadly US-Canada border car blast that was being driven towards the Canadian border from the US before crashing and bursting into flames.

In the early hours of Wednesday morning, an incident occurred on the Rainbow Bridge at the US-Canada border near Niagara Falls.

It resulted in the deaths of the couple in the car, as well as the injury of a US border agent.

In the course of investigating what happened, Police look for clues in deadly US-Canada border car blast and bridge was reopened on Thursday evening.

As a precaution, authorities closed several ports of entry between Canada and the US in the area on the eve of Thanksgiving.

Kathy Hochul, governor of New York, later ruled out terrorism, but the couple’s identity remains unknown.

At around 11:30 local time (16:30 GMT) on Wednesday, the explosion caused serious disruption on one of the busiest travel days of the year.

According to Hochul, the car sped past an 8ft (2.4m) fence near a checkpoint on the New York side of the border at a “very high rate of speed”.

Nothing but the engine remained from the vehicle after it was “incinerated,” Ms Hochul said. Not even a registration plate was recovered.

It has been confirmed by US law enforcement that the two people inside the car were married. There is no clear explanation for why they crashed, however.

New York City Mayor Robert Restaino told the New York Times that the couple were both in their 50s and were business owners from nearby Grand Island.

Restaino said they were driving an older Bentley model on their way to a cancelled Kiss concert in Canada.

Police are also looking into whether the car may have accelerated due to a mechanical failure, Mr Restaino said.