With the United States on track to pull all troops out of Afghanistan by August 31, Afghans and foreign powers are increasingly fearful the country will descend into civil war. As peace talks with the Afghan government stagnate, the Taliban says it has secured control over approximately 80% of the country, surrounding most major cities. In the new FRONTLINE report , correspondent Najibullah Quraishi investigated how Afghanistan’s neighbors — particularly Iran, through its proxy militia, the Fatemiyoun — are looking to fill the void as America withdraws. Quraishi spoke to Taliban leaders and former fighters who claimed Iran is mobilizing the Shia Fatemiyoun within Afghanistan. In return, a Sunni Taliban leader told Quraishi he would target and kill Afghanistan’s Shia minority, accusing them of harboring Fatemiyoun fighters.