WASHINGTON -- The White House says the release of 91,000 secret military documents is a breach of federal law and a potential threat to U.S. military personnel. White House spokesman Robert Gibbs says President Barack Obama was alerted to the leak last week after administration officials met with news organizations who had access to the documents. The documents on Afghanistan were posted online by the whistle-blower WikiLeaks. The organization's founder says he still has thousands more Afghan files to post. Britain and Pakistan have joined the White House in condemning the release of classified documents. Afghanistan's government says it is shocked by the leak but insists that most of the information is not new.