London Guardian 
February 3, 2012
Iranian agents are attempting to attack Israeli targets around the world in retaliation for covert operations, including the assassination of Iranian nuclear scientists, the head of Shin Bet, the Israeli security agency, has warned.
“It doesn’t matter if it’s true or not that Israel took out the nuclear scientists. A major, serious country like Iran cannot let this go on. They want to deter Israel and extract a price so that decision-makers in Israel think twice before they order an attack on an Iranian scientist,” Yoram Cohen said in a lecture reported in Haaretz .
Three attempted attacks were thwarted at the last minute in the past year, in Turkey, Azerbaijan and Thailand, he said.
Four Iranian nuclear scientists have been assassinated in the past two years in what Iran – and many others in the international community – believe are operations by the Israeli secret services, or its proxy agents, as part of a covert war.
Israel usually maintains a code of silence on activities by its security agencies, Shin Bet and the Mossad. But the president, Shimon Peres, said “to the best of my knowledge” the country was not involved in the most recent assassination, less than a month ago.