US officials have appealed to the website Wikileaks not to publish a further 15,000 classified documents on the Afghanistan war.

The documents were leaked to the website along with 75,000 other files.

White House spokesman Robert Gibbs said there should be no more damage to US security.

Wikileaks website founder Julian Assange said the remaining documents were deliberately being held back in order to carry out checks for possible harm to individuals.

But Mr Assange said there was no evidence to back up US concerns that any informants had died as a result of the leaks

Wikileaks released more than 90,000 US Afghan war records spanning a six-year period on Sunday.

Mr Gibbs told NBC's ‘Today’ show there was little the government could do halt the release of the papers.

‘We can do nothing but implore the person who has those classified top secret documents not to post any more,’ he said. ‘I think it's important that no more damage be done to our national security.’

He expressed concern that the document dump might expose US intelligence-gathering methods and place in jeopardy people who had assisted the United States.

‘You have Taliban spokesmen in the region today saying they're combing through those documents to find people that are cooperating with American and international forces. They're looking through those for names. They said they know how to punish those people,’ Mr Gibbs said.

Meanwhile, Mr Assange has said that Wikileaks had held back the remaining 15,000 papers to protect innocent people from harm, and was reviewing them at the rate of about 1,000 a day.

He did not say if and when they would be published.

Mr Assange hit back at comments from Admiral Mike Mullen, chairman of the Joint Chiefs of Staff, on Thursday, that Wikileaks ’might already have on their hands the blood of some young soldier or that of an Afghan family.’

He accused US Defence Secretary Robert Gates of attacking Wikileaks to ‘distract attention from the daily deaths of civilians and others in Afghanistan.’

‘There is real blood in Afghanistan, and it has come about as a result of the policies of Mr Gates and the Obama administration and the general conflict in the region,’ Mr Assange said.