WikiLeaks Under Attack, It Says, As New Leak Looms

The whistleblower website WikiLeaks is under cyber attack, but even if it goes down, a new cache of leaked U.S. diplomatic cables will still be published Sunday night, it said via Twitter Sunday.

The announcements come shortly after the United States warned WikiLeaks editor-in-chief Julian Assange that publishing the papers would be illegal and endanger peoples' lives.

The New York Times, The Guardian newspaper in England, and newspapers and magazines in three other European nations are planning to publish new classified material on Sunday, WikiLeaks said on Twitter.

The site is experiencing a distributed denial of service (DDOS) attack, it said. That's an effort to make a website unavailable to users, normally by flooding it with requests for data.

The U.S. State Department's legal adviser said Saturday that if any materials in the posting of documents by the site were provided by government officials without proper authorization, ""they were provided in violation of U.S. law and without regard for the grave consequences of this action.""

WikiLeaks indicated last week that it was preparing to release a new batch of previously classified U.S. military documents.""Next release is 7x the size of the Iraq War Logs,"" the group stated via Twitter Monday. ""Intense pressure over it for months. Keep us strong."""