Church leaders from the former Central Equatoria state are offering to mediate between the government and the rebels of the National Salvation Front; some foreigners have mastered colloquial Arabic known as Juba-Arabic to help them take advantage of vast business opportunities in the South Sudan capital Juba; some Internally Displaced Persons sheltering in a un-run Protection of Civilians site in juba say security forces should be cantoned to allow civilians to move freely.