Israeli newspapers on Sunday were thick with innuendo, the front pages of the three largest dailies dominated by variations on the headline “Mysterious Explosion in Iranian Missile Base.” Turn the page, and the mystery is answered with a wink. “Who Is Responsible for Attacks on the Iranian Army?” asks Maariv, and the paper lists without further comment a half-dozen other violent setbacks to Iran’s nuclear and military nexus. For Israeli readers, the coy implication is that their own government was behind Saturday’s massive blast just outside Tehran. It is an assumption a Western intelligence source insists is correct: the Mossad — the Israeli agency charged with covert operations — did it. “Don’t believe the Iranians that it was an accident,” the official tells TIME, adding that other sabotage is being planned to impede the Iranian ability to develop and deliver a nuclear weapon. “There are more bullets in the magazine,” the official says.