Enlarge By Carl Court, AFP/Getty Images WikiLeaks founder Julian Assange waves from his car in Norfolk, England, in December. U.S. officials have subpoenaed Twitter demanding details about the accounts of Assange and Army Pfc. Bradley Manning. Federal authorities investigating WikiLeaks, the organization that disclosed secret details of the Afghan war and other sensitive data, have won a federal court order demanding details about Twitter accounts linked to the group. A Dec. 14 order by Magistrate Judge Theresa Buchanan directed Twitter Inc. to give federal prosecutors in Virginia account information for WikiLeaks founder Julian Assange and Bradley Manning, a U.S. Army intelligence analyst who is suspected of giving WikiLeaks classified information. The order, posted Saturday on WikiLeaks' website, seeks contact information, subscriber names, connection and payment records, correspondence and records of user activity for any Twitter accounts linked to the two men since November 2009. The order demands the same information for Birgitta Jonsdottir, an Icelandic parliament member and onetime WikiLeaks associate, Rop Gonggrijp, a Dutch computer hacker, and Jacob Appelbaum, a U.S. computer programmer. The information is "relevant and material to an ongoing criminal investigation," according to the order, which originally directed Twitter to keep the matter secret but was unsealed Jan. 5, enabling the company to disclose the demand to its subscribers and customers. Disclosure of the court order provided the first public details of the investigation vowed by U.S. Attorney General Eric Holder in November after WikiLeaks' most recent disclosure posted State Department cables with sensitive and in some cases embarrassing information about U.S. government relations with officials of other nations. Manning remains in federal custody as federal investigators pursue any evidence showing that he illegally leaked classified government information to WikiLeaks, or that the organization and those related to it conspired to arrange such exchanges. The Justice Department declined to comment on the court order, which was issued in response to a subpoena by federal prosecutors. Twitter, while declining to comment directly on the legal demand, said Sunday its policy is "to notify users about law enforcement and governmental requests for their information, unless we are prevented by law from doing so." Assange, in an email sent to the Associated Press, pledged to fight the court order. "If the Iranian government was to attempt to coercively obtain this information from journalists and activists of foreign nations, human rights groups around the world would speak out," he said. In a posting on his Internet blog, Gonggrijp wrote: "I would have guessed that the U.S. government has more discreet and effective ways of getting my (computer Internet protocol) number and credit card details, which is essentially all this would get them." "Now's a good time to note that the world needs strong anonymity," Appelbaum tweeted. Iceland officials summoned the U.S. ambassador in Reykjavik to explain why federal investigators sought information regarding Jonsdottir, the Associated Press reported Sunday. We've updated the Conversation Guidelines. Changes include a brief review of the moderation process and an explanation on how to use the "Report Abuse" button. Read more