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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.

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A year ago, Iranian television broadcast the confession of one alleged agent who described studying a scale model of the home of the scientist he helped assassinate by hiding a bomb on a motorcycle outside the front door. "It was the exact copy of the real one, even the size, material, its color, the tree next to it, its asphalt, the street curb, the bridge," said Majid Jamali Fashi on the air. He said he viewed the model in Mossad's headquarters in Tel Aviv, which he described in detail. Intelligence sources confirmed Fashi's involvement in a Mossad cell that the sources claim was revealed to Iran by a third country.

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The similarities among the attacks were not lost on Iranian authorities, who immediately blamed both Israel and the U.S. for Wednesday's attack. "The bomb was a magnetic one and the same as the ones previously used for the assassination of the scientists and is the work of the Zionists," Tehran's Deputy Governor Safar Ali Baratlou was quoted as saying by the Fars News Agency.

Who Killed an Iranian Nuclear Expert? Israel Isn't Telling - TIME