New York's 2governor trying to 3piece together for the public what happened when a car crashed into a secondary 4border checkpoint at the U.S.-Canada border, causing the shutdown of four land 5crossings on one of the busiest travel days of the year. 

In video of the incident provided by 6law enforcement, you can see a car driving at an extreme 7rate of speed and jumping a 8curb and a 9barrier. 

"I seen something 10airborne. I first thought it was an airplane, look like slow motion. And I said, my God, it's a car. And it's a vehicle and it's flying through the air."

Authorities believe the car involved in the 11explosion was a 2022 Bentley. Sources say, the car coming from the U.S. side of the border on the Rainbow Bridge went through an initial checkpoint just before noon. Passports and licenses were checked before the car was 12directed toanother area for a secondary search. 

After the car speeded to that secondary checkpoint, an explosion occurred. 

Authorities are 13investigating what caused the massive explosion, which covered the area in smoke for hours. 

"This vehicle basically 14incinerated. Nothing is left but the engine. The pieces are scattered over 13, 14 booths. So, it is a large scene."

Authorities have not 15identified the driver, but law enforcement sources say the driver was a man traveling to Canada with his wife to attend a concert by the rock group KISS, but going to a casino in the U.S. instead when that was canceled, investigators believe. The crash occurred sometime after the couple left the casino, law enforcement sources tell CNN. The couple died in the accident. A 16border patrol employee in a booth was also 17injured. The FBI 18concluded their investigation saying no ties to terrorism or explosive material was found.