U.S. Army General Dan McNeill, the commander of NATO forces in Afghanistan, said more than 50 roadside bombs and timers were discovered by British special forces last month crossing the border in trucks from Iran to Afghanistan, The Daily Telegraph reported Thursday.

He said the discovery is evidence that Iran's Quds Revolutionary Guards are providing active support to Taliban militants.

"I cannot see how it is possible for at least the Iranian military, probably the Quds force, to not have known of this convoy," McNeill said.

McNeill said the intercepted trucks contained materials needed to create the same type of explosive devices that U.S. and British forces have accused Iran of supplying to Iraqi insurgents.

"This confirms our view that elements within Iran are supporting the Taliban," a spokesman for the British embassy in Kabul said. "We have previously raised the issue of arms to the Taliban with the Iranians and will continue to do so."