US intelligence agencies assessed that Iran offered bounties to Taliban fighters for targeting American and coalition troops in Afghanistan, identifying payments linked to at least six attacks carried out by the militant group just last year alone, including a suicide bombing at a US air base in December, CNN has learned.

“Bounties” were paid by a foreign government, identified to CNN as Iran, to the Haqqani network — a terrorist group that is led by the second highest ranking leader of the Taliban — for their attack on Bagram Air Base on December 11, which killed two civilians and injured more than 70 others, including four US personnel, according to a Pentagon briefing document reviewed by CNN.

The name of the foreign government that made these payments remains classified but two sources familiar with the intelligence confirmed to CNN that it refers to Iran.