The Argentinian special prosecutor Alberto Nisman, found dead in his apartment earlier this week, had uncovered much about Iran’s extensive terror network in South America over the course of his decade-long investigation. Claudia Rosett recounts some of his findings, and examines what they might mean for the U.S.:

According to Taliban officials, Islamic State’s Afghanistan offshoot (known as the “Khorasan province,” or ISKP) has but a negligible presence. American diplomats, for their part, have claimed that the new jihadist government in Kabul can provide a bulwark against the group, which opposes what it sees as the Taliban’s relative religious moderation. But, Oved Lobel argues, the evidence supports neither interpretation: