The story: As the dust from the deadliest terrorist attack in Iran’s recent history settles, authorities in Tehran have divulged that one of the two suicide bombers was a Tajik national. The Iranian intelligence ministry has also suggested that beyond a crackdown at home, extra-territorial operations are on its agenda.

Targeting a ceremony to mark the fourth anniversary of the US killing of late Quds Force commander Qasem Soleimani, the Jan. 3 bombings killed more than 90 people. The attack is the third carried out by the Islamic State group (IS) since conservative President Ebrahim Raisi took office—triggering calls for the dismissal of his interior minister.

The coverage: In its first statement since the suicide bombings in the southeastern city of Kerman, Iran’s intelligence ministry on Jan. 5 said it had identified one of the two bombers as a citizen of...