"We are about halfway through them, this is a very expensive issue," said Assange.
However, the Pentagon warned WikiLeaks Thursday, Aug 12, against releasing more documents.
"It would compound a mistake that has already put far too many lives at risk," said US official.
He also asked WikiLeaks to remove and delete all the secret data, which the website had posted on its sites earlier.
"If they were to publish any additional documents after hearing our concerns about the harm it will cause our forces, our allies and innocent Afghan civilians, it would be the height of irresponsibility," he added.
Assange, however, said he is "absolutely" committed to move forward with the release.
WikiLeaks released almost 92,000 secret US military records about the war in Afghanistan in Jul, 2010.
Countries across the world are now pouring over the documents.