At least four tankers have been struck by drones and maritime traffic has dropped by 80%, reports sayIran has effectively closed the strait of Hormuz to oil and gas exports for the past four days with a mixture of drone strikes and fear that has halted commercial maritime traffic despite intense US attacks on Iran’s navy.At least four tankers have been struck and Lloyd’s List Intelligence reported that seaborne traffic had dropped by 80% on Sunday, with little sign of a return as key maritime in...