Iran has launched retaliatory air strikes at Israel, with explosions heard in Jerusalem and Tel Aviv, the country’s two biggest cities, following Israel’s biggest-ever military strike against Iran. Air raid sirens sounded across Israel as authorities urged the public to take shelter. Missiles were seen over Tel Aviv’s skyline, with the military saying Iran had fired two salvos. The US military has helped shoot down Iranian missiles that were headed toward Israel, two US officials said on Friday. In the Tel Aviv area, Israel’s ambulance service said five people were treated for shrapnel injuries. Live footage of Tel Aviv showed...