A massive search-and-rescue operation is underway after a US Navy MH-60S Seahawk helicopter went down in the Arabian Sea during flight operations from the USS George H.W. Bush aircraft carrier. Four crew members were aboard the helicopter. Three were rescued and are reported to be in stable condition, while one US service member remains missing. The US Navy has deployed extensive air and naval assets in a race against time to locate the missing sailor. The incident comes amid heightened tensions in the Middle East and ongoing US-Iran negotiations. The US Navy has launched an investigation into the cause of the emergency landing and says there is currently no indication that hostile forces were involved.