NATIONAL BRIEFING / NEVADA

A tour bus driver already worried about a stuck door was blinded by the sun’s glare just before the bus crashed near Hoover Dam last month, killing seven passengers, according to a National Transportation Safety Board investigator.

Witnesses said the driver’s door was open right before the bus crashed. The driver also “indicated he was blinded by sun glare” just before he lost control of the bus carrying a Chinese tourist group to Las Vegas from the Grand Canyon.

Investigators have not found anything wrong with the driver-side door, or any other mechanical problems. A determination of the cause of the crash along U.S. 93 in Arizona is not expected until next year.