SAN FRANCISCO >> One of two women killed when a Greyhound bus overturned on a San Jose highway had recently moved to the United States from the Philippines to be close to her three sons, a family member said.

Antonio Olivera said his mother, Fely Olivera, was traveling back home to San Francisco from Los Angeles, where she had visited her other sons.

“I was hoping my mother was one of the passengers that got injured so, I called hospitals in San Jose and I called emergency rooms but they said my mom was not on their lists,” said Antonio Olivera.

Authorities have not released the identity of the victims. But Antonio Olivera said he was notified by the Santa Clara County coroner’s office that his 51-year-old mother died in Tuesday’s crash. The coroner’s office couldn’t be reached for comment.

Authorities said the bus driver told investigators he was fatigued before the vehicle plowed into safety barrels on a highway and flipped on its side early Tuesday, killing the two women and sending at least eight other people to the hospital, authorities said.

The driver, who has been released from a hospital, stopped for a caffeine jolt at the last stop before the wreck, about 30 miles south in Gilroy, according to the California Highway Patrol.

“He stated that he did feel fatigued and that he did get some coffee in Gilroy when he dropped off two passengers,” CHP Officer Chris Miceli said, adding that the cause of the crash was still under investigation.

The bus carrying 20 passengers hit the barrels and then rolled onto the center divider of U.S. 101 in San Jose, a major commuting thoroughfare, said Lanesha Gipson, a Greyhound spokeswoman.

One person suffered major injuries, and three others were moderately hurt, officials said. Several others had minor injuries and got patched up at the scene or were ferried to a hospital to be treated for cuts and bruises.

The bus left Los Angeles at 11:30 p.m. Monday with stops planned in Gilroy, San Jose, San Francisco and Oakland, Gipson said. The driver began his shift in LA, and the company requires operators to rest nine hours between trips, she said.

The driver was asked to submit a blood sample to test for alcohol and drugs, Miceli said. Prosecutors have been notified, which is a routine measure, he said.

In addition to the CHP inquiry, the National Safety Transportation Board is sending a team of investigators, agency spokesman Eric Weiss said.

Authorities have not released the identity of the driver.

Antonio Olivera said his mother was a stay-at-home mom who loved to take care of her family and had immigrated to California from the Philippines in September.

“I thought she would die from getting sick and not from being ejected from a bus,” said Olivera, 25. “I haven’t seen her body. I’m still hoping it’s a different person.”