By John Letzing, Peter Kenny and Alistair Barr 

GENEVA--WikiLeaks said Monday the whistleblower website is demanding answers from Google Inc. about why the Internet search giant appears to have handed WikiLeaks staff members' personal data to U.S. law enforcement nearly three years ago.

At a news conference held in Geneva, Judge Baltasar Garzón, the director of a legal team representing WikiLeaks founder Julian Assange, said three members of the WikiLeaks staff were only informed in December by Google that the Mountain View, Calif.-based company had provided data from their Google accounts--including the contents of emails--to federal investigators in 2012.

The data were provided in response to search warrants concerning espionage and theft that Mr. Garzón said are a part of a continuing federal criminal probe of WikiLeaks. He argued that the requests violated the staff members' constitutional rights. "This action is illegal, and unacceptable," he said.

Mr. Garzón's news conference coincided with a statement published by WikiLeaks on its website arguing that the warrants could have been challenged, had the staff members received prior notice. "Google handed everything over before that was possible," WikiLeaks said.

A spokeswoman for Google said in a statement, "We don't talk about individual cases. Obviously, we follow the law like any other company. When we receive a subpoena or court order, we check to see if it meets both the letter and the spirit of the law before complying. And if it doesn't we can object or ask that the request is narrowed. We have a track record of advocating on behalf of our users."

A spokeswoman for the U.S. Justice Department didn't immediately respond to a request for comment.

In a letter published by WikiLeaks and addressed to Google Chairman Eric Schmidt, attorneys representing the WikiLeaks staff members said that, "We are astonished and disturbed that Google waited over 2 1/2 years to notify its subscribers that a search warrant was issued for their records." The letter included a demand for a list of all of the materials provided by Google, and an explanation of whether or not the company challenged the government requests.

The letter also included a transcript of a conversation that WikiLeaks says took place between Messrs. Schmidt and Assange in April 2011, in which the Google chairman allegedly said he would convey a request from Mr. Assange to Google's general counsel that WikiLeaks be informed if Google is asked to fulfill legal requests for information about its staff. "I'll pass that along," Mr. Schmidt is quoted as saying.

WikiLeaks described its staff members, Sarah Harrison, Kristinn Hrafnsson and Joseph Farrell, as journalists and editors. The organization said in a statement that its journalists don't use Google to communicate internally or with sources, though the warrants "represent a substantial invasion of their personal privacy and freedom."

Mr. Assange has been seeking for years to avoid extradition to Sweden, where he has been accused of sexual assault, amid concerns that Swedish officials may hand him over to the U.S. The WikiLeaks founder has been granted asylum by Ecuador, and has lived in Ecuador's London embassy since 2012.

Mr. Garzón's news conference was timed to begin following Sweden's periodic review session at the United Nations Human Rights Council in Geneva, where the country's recent human rights record was to be assessed by fellow members.

Write to John Letzing at john.letzing@wsj.com and Alistair Barr at alistair.barr@wsj.com

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