The Iranian-backed group Hezbollah has fired rockets from Lebanon into Israel for a second day while the Israeli military has sent troops into the south of the country, as Lebanon is dragged into the war between US, Israel and Iran. Israel has also carried out air strikes that have killed dozens of people, according to Lebanese health officials. On Monday, after the regional conflict spread to Lebanon, thousands of residents fled villages in the south and, in Beirut, displaced families gathered in the city's Martyrs' Square and on the promenade along the Mediterranean. The Israeli bombing was in response to rockets and drones that had been fired by Hezbollah, the Shia Muslim militia and political party, to avenge the killing of the Iranian Supreme Leader, Ayatollah Ali Khamenei, in an attack on his compound in Tehran on Saturday. Hezbollah's actions were largely symbolic, but Israel's retaliation came with force.…