Morocco has expelled United Nations staffers from Western Sahara. The move comes after U.N. Secretary-General Ban Ki-moon used the term “occupation” to describe Morocco’s relationship to Western Sahara during a recent visit to the region. The expulsion of the U.N. staffers puts at risk the ceasefire between Morocco and the Sahrawi people’s Polisario Front. The Sahrawi have demanded independence ever since Morocco took over most of Western Sahara in 1975.