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Uber has extended its internal investigation into sexual harassment claims at the company, according to sources.

The investigation, led by former U.S. Attorney General Eric Holder, was sparked by charges of sexual harassment by a former female engineer as well as charges of a wider cultural problem across Uber. Holder has asked the board for more time to complete his inquiry, the sources say.

Holder has not gotten interviews with several key figures in the investigation, including top HR execs, as yet, according to sources. He plans to do so in the coming weeks.

Some insiders are skeptical the review will yield results, but now Uber has come under more pressure after the sexual harassment scandal at Fox News led to the ouster of Bill O’Reilly.

Uber is worried about the tide of public opinion. "We've got to get this right," said one person close to the situation.

Uber CEO Travis Kalanick hired Holder earlier this year to conduct an internal review to look into allegations of harassment and a hostile workplace culture.

Board director Arianna Huffington briefly outlined the current state of the investigation in a memo to employees that was sent out tonight:

Subject line: An update on the Holder report Hi everybody, When Eric Holder and Tammy Albarrán began their review, the Board subcommittee (consisting of David Bonderman, Bill Gurley, and myself) to which Eric and Tammy have been reporting on a weekly basis assured them that they would have all the support and time necessary to conduct an intensive, thorough review of Uber’s workplace and culture. Eric and Tammy have now asked us for more time to complete their assessment, which includes information received from hundreds of employees through interviews and anonymous online focus groups and reflects the global scale of the company’s operations. To ensure that no stone is left unturned, the Board subcommittee has granted that request and we anticipate the report by the end of May. Thank you, Arianna

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