Image caption: One US official identified the drone as a US Navy MQ-4C Triton A US military drone has been shot down by an Iranian surface-to-air missile while in international airspace over the Strait of Hormuz, US officials say. Iran's Islamic Revolution Guards Corps (IRGC) said it shot down the drone over Iranian airspace, near Kuhmobarak in the southern province of Hormozgan. IRGC commander Maj-Gen Hossein Salami said the incident sent "a clear message to America", state media said. It comes at a time of escalating tension between the US and Iran. On Monday, the US defence department said it...