The leak of 90,000 secret military files triggered an outcry from nations fighting in Afghanistan as the Pentagon scrambled to uncover the source of the security breach and whether it would endanger lives.
US experts were working to see if the huge cache "could jeopardize force protection or operational security, or even worse still, the national security of this country," Pentagon spokesman Geoff Morrell told Fox News.
"Our big fear of course is that there is information in here which could potentially put the lives of our troops in Afghanistan or elsewhere at risk."
|Australian founder of whistleblowing website, 'WikiLeaks', Julian Assange, holds up a copy of today's Guardian newspaper during a press conference in London.|
Some 92,000 documents dating from 2004 to 2009 were released to The New York Times, Britain's Guardian newspaper and Germany's Der Spiegel news weekly by the website WikiLeaks, which posted them on Sunday.
The most controversial allegations center around claims that Pakistan, a key US ally in the turbulent region, allows its spies to meet directly with the Taliban.
According to the Times, Pakistan agents and Taliban representatives meet regularly "in secret strategy sessions to organize networks of militant groups that fight against American soldiers in Afghanistan, and even hatch plots to assassinate Afghan leaders."
The files also maintained that the deaths of innocent civilians have been covered up, and that Iran is funding Taliban militants eight years after the 2001 US-led invasion ousted the radical Islamic regime from power.
The bombshell revelations triggered outrage, with a top NATO general calling for increased vigilance against such leaks as the White House slammed them as "irresponsible."
The coalition needed to be aware that some "documents are pushed out into the open via leaks, but that obliges us even more to work with the greatest care," said General Egon Ramms, who is in charge of NATO forces in Afghanistan.
White House spokesman Robert Gibbs condemned the leak, warning the names of service personnel and military operations were now in the public domain, but laid down the likely strategic and political impact.
"In terms of broad revelations, there aren't any that we see in these documents," Gibbs said, pointing out that most of the period covered by the leaks was during the previous Bush administration.
Britain, which has some 9,500 troops in Afghanistan, said Monday it regretted the leak, as Pakistan said the reports were "skewed" and not based on the reality on the ground.
But WikiLeaks founder Julian Assange defended the decision to publish the leaked files, saying they showed "thousands" of war crimes may have been committed in Afghanistan.
"It is up to a court to decide clearly whether something is in the end a crime. That said, prima facie there does appear to be evidence of war crimes in this material," he said, citing a missile strike on a house which killed seven children.
In Berlin, a defense ministry spokesman said releasing the documents "could affect the national security of NATO allies and the whole NATO mission."
The leaks reportedly link the ISI, Pakistan's intelligence service, to a failed plot to kill Afghan President Hamid Karzai, attacks on NATO warplanes, a bid to poison the beer supply of Western troops and the 2008 Indian embassy bombing.
In April 2007, the Guardian said the ISI allegedly sent 1,000 motorbikes to Jalaluddin Haqqani, head of the Taliban and Al-Qaeda-linked Haqqani network based in Pakistan, to carry out suicide attacks in Afghanistan.
WikiLeaks has not named its informant. But some observers are pointing suspicion at a US soldier, Bradley Manning, who has been arrested and charged in Iraq for allegedly leaking classified information to the website, including video of a helicopter strike in Baghdad.
Last month, the Pentagon was probing allegations that Manning supplied the classified video and 260,000 secret diplomatic cables to WikiLeaks.
As well as releasing the video, Manning, 22, has been accused of illegally downloading more than 150,000 diplomatic cables, 50 of which he is alleged to have transmitted unlawfully to the danger of US national security.
A top Republican lawmaker, US Senator Kit Bond, blasted the source of the leak, saying: "It is shocking that any American, much less someone in the Pentagon, would betray his country and possibly put our soldiers at risk."