Israeli warplanes broke the sound barrier three times over Beirut in less than 30 minutes on Tuesday, leading to loud booms that sent people in the city running for cover just ahead of a speech by the head of the powerful Iran-backed group Hezbollah. Israeli warplanes flew low over the Lebanese capital, with witnesses saying they could see the planes with the naked eye. The booms were the loudest heard in Beirut in years. Also Read | Hezbollah’s barrage of missiles, Iran’s retaliation: What Israel is bracing for as Middle…