Uber has hired former U.S. attorney general Eric Holder to help lead an investigation into claims of sexual harassment and discrimination that a former female employee made public over the weekend in a highly circulated blog post.

CEO Travis Kalanick told employees in a memo Monday that the review will be conducted in "short order" and that it will involve, among others, the participation of Arianna Huffington, founder of the Huffington Post and an Uber board member, and Liane Hornsey, the company's recently hired human resources chief.

Susan Fowler Rigetti wrote that during her year working as an engineer at Uber she and other female staffers reported multiple instances of sexual harassment and discrimination to the company's human resources department.

Rigetti wrote that soon after starting at the company she received messages from a manager stating he was in an "open relationship" and that he made advances toward her. When she reported the incident to human resources, Rigetti wrote, she was told it was the manager's first offense and she was advised to transfer teams. Rigetti writes that she later learned other women had also complained about the same manager.

"It was such a blatant lie that there was really nothing I could do. There was nothing any of us could do. We all gave up on Uber HR and our managers after that," wrote Rigetti, who now works for online payment firm Stripe, according to her LinkedIn profile.

In a tweet on Sunday, Uber CEO Travis Kalanick called the behavior described in Rigetti's blog post "abhorrent & against everything we believe in" and pledged that "anyone who behaves this way or thinks this is OK will be fired."

The allegations come as the San Francisco-based ride-hailing service is still containing fallout over Kalanick's former role as an adviser to President Donald Trump and the company's response to the executive order banning travel by citizens from seven Muslim-majority countries.

During last month's protests against the travel ban, Uber continued to provide rides to flyers arriving at New York's John F. Kennedy Airport even after the city's taxi cabs went on strike to show solidarity with protesters. That sparked a social media campaign calling on users to #DeleteUber, and those calls were renewed this weekend following Rigetti's blog post.

In another incident, Rigetti alleges that all of the team's male engineers were given leather jackets as a company perk, but the female engineers were not because there were too few of them to qualify for a bulk discount. Rigetti reported the unequal treatment to human resources and was subsequently called into a meeting, she wrote.

"The HR rep began the meeting by asking me if I had noticed that *I* was the common theme in all of the reports I had been making, and that if I had ever considered that I might be the problem," Rigetti writes.

In his memo, Kalanick told employees that the review conducted by Holder will investigate both Rigetti's claims and "diversity and inclusion at Uber more broadly."

"What is driving me through all this is a determination that we take what's happened as an opportunity to heal wounds of the past and set a new standard for justice in the workplace," Kalanick wrote to employees.

Uber is not the first Silicon Valley firm to face allegations of sex-based harassment and discrimination, and tech culture has been criticized in the past for being inhospitable to women and minorities. Many of the region's high-profile tech firms have come under fire for their lack of female and minority employees, particularly in engineering and other technical roles.

Kalanick wrote that 15.1 percent of Uber employees in scientist, product management and engineering roles are women, and that the company plans to publish a more comprehensive report on Uber's diversity in the coming months.

Uber representatives declined to comment for this story.