Yahoo! News reported that US officials have subpoenaed the Twitter account of WikiLeaks, the secret-spilling site announced on Saturday.
WikiLeaks suspected that Washington is asking other US Internet companies to give them details of their activities.
US investigators demanded the contact information, private messages, and other personal details of WikiLeaks' editor-in-chief, Julian Assange, and three others when they went to the office of Twitter Inc. in San Francisco, WikiLeaks' statement in an email.
The secret-spiller lambasted the court order and equated it to harassment.
Assange said, "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."
Salon. com reported today that a former volunteer of WikiLeaks and currently a member of the Parliament of Iceland--Birgitta Jónsdóttir--had been notified by Twitter that the Department of Justice (DOJ) had issued a subpoena demanding information "about all my tweets and more since 1 November 2009."
Other people included in the subpoena were Jacob Appelbaum, Rop Gonggrijp, and Julian Assange. The DOJ also seeks information for Bradley Manning, the American military man currently in jail for leaking the cables to Assange.
The US has been gathering evidences and studying possible offences committed by WikiLeaks after releasing thousands of diplomatic cables that have embarrassed government officials and stained the White House's image.
The State Department said the leaks have damaged US diplomatic relations and put the human rights activists and others at risk.
WikiLeaks refuted the charge and said the government was acting out of shame over the leaked cables.