Like three previous Iranian scientists ambushed on their morning commute, the latest nuclear expert to die on his way to work was a victim of Israel’s Mossad, Western intelligence sources tell TIME. Mostafa Ahmadi-Roshan, an expert on a phase of uranium enrichment, perished on a Tehran street on Wednesday after an assassin in a passing motorcycle attached a magnetized explosive to the side of his Peugeot 405. “Yeah, one more,” a senior Israeli official said with a smile. “I don’t feel sad for him.”
Wednesday’s attack followed the pattern of previous operations planned by Mossad and carried out over the past two years by Iranians trained and paid by Israel’s spy agency, according to intelligence sources. The targets were chosen from the ranks of scientists seen as crucial to Iran’s nuclear effort — the country’s top physicist, Majid Shahriari, was killed by a magnetized bomb in October 2010 — then shadowed for weeks to determine their routines and points of vulnerability.