 The 1979 Iranian Revolution would have a negative effect on South Korean business in Iran, as well as proving dangerous for Korean workers in the country; on one occasion, revolutionaries attacked a construction site seeking to drive away "foreign devils"; five workers were killed and twenty others injured in a traffic accident that arose as they fled.The Korean Air Force had to be called in to evacuate Korean nationals.The number of South Koreans going to Iran fell from 7,418 in 1978 to 64 in 1979 and only 30 in 1980, though by 1985 the rate of migration had recovered to almost half of its pre-revolutionary level, with 3,669 migrants.