In 1958, on the eve of neighboring Somalia's independence in 1960, a referendum was held in Djibouti to decide whether to remain with France or to be an independent country. The referendum turned out in favour of a continued association with France, partly due to a combined yes vote by the sizable Afar ethnic group and resident French. There were also allegations of widespread vote rigging. The majority of those who had voted no were Somalis who were strongly in favour of joining a united Somalia as had been proposed by Mahmoud Harbi, Vice President of the Government Council. Harbi was killed in a plane crash two years later under suspicious circumstances.