The story: Iranian authorities have launched an investigation into the "act of sabotage" at a centrifuge production center outside the capital Tehran last week. While details remain murky, Tehran says the June 23 incident was foiled and caused no casualties or damage. It follows a chain of attacks targeting Iran's nuclear program blamed on Israel, and comes as talks on the revival of the Iran nuclear deal are at a critical juncture.

The coverage: The initial report of the “sabotage” was published early June 23 by Nour News, a conservative outlet linked to Iran's Supreme National Security Council...