Relatives of the driver killed in a chase near the White House have told police that she had mental health issues, NBC News reports citing a senior law enforcement official.
Miriam Carey, 34, is said to have had a fall a couple of years ago leading to the issues.
Carey's employer corroborated that she had suffered a fall, and that she had returned to work pregnant.
More top news
Storm Imogen will cause problems across much of the south today, but it will be calmer in the north.
David Cameron is expected to warn that voting for a "Brexit" would result in refugee camps springing up across the south-east of England.
Beyonce, Coldplay and Bruno Mars performed a medley of their hits during a powerful half-time performance at Super Bowl 50.