‍The mother of ride-hailing firm Uber's chief executive officer died in a boating accident near Fresno, California on Friday, the Fresno County Sheriff's Office confirmed on Saturday.

Uber CEO Travis Kalanick's parents Bonnie Kalanick, 71, and Donald Kalanick were on Pine Flat Lake when their boat struck a rock and sank, the office said, adding that an autopsy is planned for Sunday.

Kalanick with his parents at the Kentucky Derby on May 6. / Twitter Photo

Donald Kalanick was being treated at an area hospital for what were described as moderate injuries.

Uber officials were not immediately available for comment.

The sheriff's office, however, posted a statement from Uber that read: "Last night, Travis and his family suffered an unspeakable tragedy."

"His mother passed away in a devastating boating accident near Fresno and his father is in serious condition. Our thoughts and prayers are with Travis and his family in this heartbreaking time," the statement said.

The Uber headquarters in San Francisco. /AP Photo

Uber has been rocked by a number of setbacks lately, including accusations of sexual harassment from a former female employee and a video showing Kalanick harshly berating an Uber driver.

Kalanick had put up a Mother's Day post on Facebook, dedicated to his mom.  /Facebook Photo

(Source: Reuters)