The story: Iran has condemned the stabbing of several clerics in the country’s largest Shiite shrine as a “terrorist operation.” Two clergymen were killed in the rare attack in the northeastern city of Mashhad, while a third victim remains hospitalized. The authorities have identified the assailant as a foreign national belonging to the “Takfiri current,” referring to Salafist extremists who deem other Muslims— especially Shiites—as heretics.

The coverage: Iranian authorities have yet to provide details on the Apr. 5 incident at the shrine of Ali Al-Ridha—the eighth Shiite Imam—but some information has been revealed by conservative media...