WASHINGTON—Before launching its attack on Iran last week, Israel provided the U.S. with intelligence it deemed alarming: Tehran was conducting renewed research useful for a nuclear weapon, including on an explosive triggering system.But U.S. officials briefed by the Israelis weren’t convinced that the information pointed to a decision by Tehran to build a bomb, according to a senior intelligence official, another U.S. official and two congressional aides familiar with the discussions.
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