Update, 2 p.m.: Federal officials are now investigating the Greyhound bus crash that killed two people and hospitalized at least eight others in South San Jose this morning.
The National Transportation Safety Board and Greyhound are also conducting investigations into the crash.
CHP spokesman Christopher Miceli says they're trying to determine if the driver fell asleep before the crash. The bus left Los Angeles last night at 11:30 p.m.
The driver of the bus told investigators that he did feel fatigued, Miceli told KQED. The driver also told them that he stopped to drop off two passengers in Gilroy and had some coffee.
Greyhound spokeswoman Lanesha Gibson says the company has strict rules to ensure its operators are alert.