The editor-in-chief of WikiLeaks said Tuesday he did not know who sent his organization some 92,000 classified U.S. government files on the war in Afghanistan.
Julian Assange claimed the whistle blower website was designed to conceal the source of its data from the recipients.
"We never know the source of the leak," he told journalists gathered at London's Frontline Club late Tuesday. "Our whole system is designed such that we don't have to keep that secret."
Assange failed to specify whether WikiLeaks was completely unaware of who sent the documents or whether his company simply couldn't be certain.
Meanwhile, Adm. Mike Mullen, the chairman of the U.S. Joint Chiefs of Staff, condemned the leak saying it threatens the security of U.S. military forces.
"I really am appalled by the leak," Mullen said Tuesday. "There is a real potential threat there to put American lives at risk."
U.S. intelligence officials are worried the disclosures have exposed the military's human intelligence network that took eight years to build in Afghanistan and Pakistan.
However, Assange dismissed the notion the leak posed any real security threat.
"You often hear ... that something may be a threat to U.S. national security. This must be shot down, whenever this statement is made. A threat to U.S. national security? Is anyone serious? The security of the entire nation of the United States? It is ridiculous!" he declared.
The Pentagon and Justice Department have launched an investigation to into the matter.