The US says it has broken up a major terror plot in which agents linked to Iran sought to assassinate the Saudi ambassador to Washington.
Two men originally from Iran — one a naturalized US citizen — have been charged with counts of conspiracy, Attorney General Eric Holder said.
The plot was "conceived" in Iran by the Quds force, part of Iran's Revolutionary Guard Corps, he added.
The state department has listed Iran as a "state sponsor" of terror since 1984.
Laura Rozen is Senior Foreign Policy reporter at Yahoo News.