Pentagon documents leak sparks US national security fears

'We don't know who's responsible for this. And we don't know if they have more that they intend to post,' White House National Security Council spokesman John Kirby told reporters [Susan Walsh/AP Photo]

The United States has said it is still assessing an apparent leak of documents containing US military intelligence, which a Pentagon spokesman said could pose “a very serious risk to national security” and lead to the spread of misinformation.

Speaking to reporters on Monday, Pentagon spokesman Chris Meagher said Washington was still investigating how the documents, which have circulated online, were made public, as well as the scope of the leak.