Israeli authorities are investigating the failure of its famed Iron Dome defence system to intercept rockets fired from southern Lebanon that killed two Israelis on Wednesday. Iron Dome interceptors have taken out hundreds of rockets fired by Lebanese Shia militant group Hezbollah, which began its armed campaign against Israel last October in response to the assault on Gaza. Israeli emergency services said a man and a woman in their 40s were hit by shrapnel in the border town of Kiryat Shmona – the first Israeli civilians to be killed by rocket fire since Israel escalated its bombing of Lebano…