Gen. Peter Pace, chairman of the Joint Chiefs of Staff, said that unlike in Iraq, where U.S. officials say they are certain that arms are being supplied to insurgents by Iran's secretive Quds Force, the Iranian link in Afghanistan is murky.

"It is not as clear in Afghanistan which Iranian entity is responsible, but we have intercepted weapons in Afghanistan headed for the Taliban that were made in Iran," Pace told a group of reporters over breakfast.

He said the weapons, including mortars and C-4 plastic explosives, were intercepted in Kandahar province in southern Afghanistan within the past month. He did not describe the quantity of intercepted materials or say whether it was the first time Americans forces had found Iranian-made arms in that country.

Asked about Pace's remarks, a Pentagon spokesman, Army Col. Gary Keck, said he had not heard of previous instances of Iranian weaponry being found in Afghanistan but he was not certain this was the first time.

With regard to Iranian activities in Iraq, Pace said it is clear that Quds Force members are involved in the network that supplies materials to make roadside bombs, which are a leading killer of U.S. troops in Iraq.

"We know that there are munitions that were made in Iran that are in Iraq and in Afghanistan," he said, adding that it also is clear that the Quds Force reports to the Iranian Revolutionary Guards, which reports directly to Iran's supreme leader, Ayatollah Ali Khamenei.

"We surmise from that one of two things: Either the leadership of the country knows what their armed forces are doing, or they don't know. In either case that's a problem," Pace said.

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