It said his Lexus struck a Buick that was waiting for a train to pass in the city of San Gabriel.
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Mr Bryson spoke to the three male occupants then left the scene, apparently hitting the car again as he did so, the media release said.
The Buick then followed Mr Bryson's Lexus and the occupants called for police assistance.
Mr Bryson was then involved in a collision with a Honda a few minutes later as he crossed into the nearby city of Rosemead, where he was found alone and unconscious behind the wheel.
He was alleged to have caused that crash as well, but investigations are at a preliminary stage, police said.
The San Gabriel incident was being investigated as a felony hit-and-run.
There were no serious injuries to the passengers in the Buick or the Honda, and Mr Bryson was treated for non-life-threatening injuries, remaining in hospital overnight on Saturday.
In a statement on Monday, a Department of Commerce official said he suffered a "seizure" in connection with the accidents. He has now returned to Washington, the official said.
Mr Bryson's Lexus and the Honda suffered minor damage, police said.
They said all parties involved had been co-operative.
http://www.bbc.co.uk/news/world-us-canada-18391700
sure right he had seizures, why did he leave the scene of two accidents or crashed 3 times!!
I like to stick it to The Man, The Man happens to be Liberal in NYC(power Structure).
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