San Gabriel, Calif.— Commerce Secretary John Bryson said Monday he will take a medical leave of absence to undergo tests and evaluations after suffering a seizure in connection with a succession of traffic accidents in the Los Angeles area.Bryson informed President Barack Obama that he was taking a medical leave "so that I can focus all of my attention on resolving the health issues that arose over the weekend," according to a statement released by the department. Deputy Secretary Rebecca Blank will serve as acting commerce secretary in Bryson's absence.White House press secretary Jay Carney said in a statement that Obama's thoughts were with Bryson and his family.The 68-year-old former utility executive struck a car stopped for a train — twice — on Saturday afternoon and then rammed into another vehicle with his car a few minutes later. He was found unconscious in his vehicle, and government officials said Monday he had had a seizure, which could play a role in whether he's charged with felony hit-and-run.It wasn't clear whether the medical episode preceded or followed the collisions, but Bryson hasn't suffered a seizure before, said a department official who spoke on condition of anonymity to discuss the secretary's medical history. Bryson has a "limited recall of the events," the official said.The crashes drew attention because of health concerns involving a member of Obama's Cabinet, as well as the challenge investigators face when trying to determine whether someone should be held criminally responsible because of adverse health.Bryson was driving alone in a Lexus in San Gabriel, a community of about 40,000 northeast of Los Angeles, when he struck the rear of a vehicle that had stopped for a passing train, authorities said.He spoke briefly with the three occupants and then hit their car again as he departed, investigators said. They followed him while calling police.He was cited for felony hit-and-run, although he has not been charged.Bryson then struck a second car in the nearby city of Rosemead, where he was found unconscious in his car, authorities said.Bryson has returned to Washington after a brief hospital stay, department spokeswoman Jennifer Friedman said.Officials said Bryson was not on state business, was driving a personal car and did not have a security detail at the time.He took a Breathalyzer test that didn't detect any alcohol, but investigators were awaiting the results from a blood test, said Los Angeles County sheriff's Capt. Mike Parker.Commerce officials said he was given medication to treat the seizure. Paramedics treated two people in the first collision for pain, but a couple involved in the second crash declined medical aid.The case was being reviewed by sheriff's investigators and will likely be submitted to prosecutors in the coming days.