Air raid sirens echoed across Jordan’s capital on Saturday to mark the start of a three-day curfew, the latest mass lockdown in the Middle East aimed at containing the coronavirus, which has claimed another 123 lives in Iran, home to the region’s worst outbreak. The latest deaths bring Iran’s overall toll to 1,556 amid 20,610 confirmed cases, according to figures released by the Health Ministry. Iran has faced widespread criticism for its lagging response to the outbreak, which has even infected and killed some senior officials.