But for reasons still unknown, the modified limo plowed through a stop sign, crashed into a parked SUV and caused the deadliest US transportation accident in almost a decade.

But for reasons still unknown, the modified limo plowed through a stop sign, crashed into a parked SUV and caused the deadliest US transportation accident in almost a decade.

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The limo that crashed and killed 20 people failed inspection. And the driver wasn't properly licensed.

The driver of the modified limo that crashed in upstate New York "did not have the appropriate driver's license to be operating that vehicle," Gov. Andrew Cuomo said Monday.