A Ukrainian Boeing 737 crashed soon after taking off from Imam Khomeini airport in Iran’s capital Tehran, killing all passengers and crew. Reports on the number of people on board ranged from 167 to 180, and state television said “technical difficulties” caused the crash. Hours earlier, Iran had fired ballistic missiles targeting US forces in neighbouring Iraq. In response, the US Federal Aviation Administration barred American pilots and carriers from flying in areas of Iraqi, Iranian and some…