Fatima Mughniyeh, the young and secret wife of Qasem Soleimani

The device was triggered remotely from Tel Aviv by agents with Mossad, the Israeli foreign intelligence service, who were in communication with the operatives on the ground in Damascus. “The way it was set up, the U.S. could object and call it off, but it could not execute,” said a former U.S. intelligence official.

The extraordinarily close cooperation between the U.S. and Israeli intelligence services suggested the importance of the target — a man who over the years had been implicated in some of Hezbollah’s most spectacular terrorist attacks, including those against the U.S. Embassy in Beirut and the Israeli Embassy in Argentina.