Web whistleblower Wikileaks owner has announced that the portal is preparing to release the remaining secret Afghan war documents, as Pentagon warned that the fresh exposures could be even more damaging to the American military than what has already come out.

The Wikileaks spokesman Julian Assange has said that his organisation is preparing to release the rest of the Pentagon documents it has on file.

Speaking over video link to media here, Assange brushed aside the Pentagon's demand that he hand over the intelligence documents, but gave no time frame for the release of the 15,000 remaining files he claims are with his portal.

The spokesman said his personnel had combed through about "7,000 files" to ensure that no names were published to put lives of US servicemen or Afghans at peril.

"We absolutely would go ahead and publish them", Assange said, but did not indicate that whether he would hand over these files to prominent media outlets.

Slamming WikiLeaks' announcement the Pentagon termed it as the height of irresponsibility.

"The only responsible course of action for them is to immediately remove all the stolen documents from their website and expunge all classified material from their computers," the Pentagon spokesman, Geoff Morrell, said.

"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," Morrell said.

Last week, the Defense Department demanded that WikiLeaks return all documents belonging to the Pentagon and delete any records of the documents.

"The only acceptable course is for WikiLeaks to take steps immediately to return all versions of all of these documents to the US government and permanently delete them from its website, computers and records," Morrell said.

However, the WikiLeaks has not responded to the call of the Pentagon.

"We have made very clear that we view the publishing of these communications very seriously and as a very serious breach and a security breach to our soldiers and diplomats overseas," the State Department Deputy Spokesman, Mark Toner, said.

WikiLeaks, the whistleblower website last month released on the Internet around 70,000 classified US military documents on Afghanistan, some of which included the names of Afghan informants.