Satellite images show details of a recent assault on the town of Abu Zabad.
Kenya project could offer South Sudan an outlet for oil exports but leave Khartoum out in the cold.
President Omar al-Bashir bowed to IMF austerity demands, and calls are now growing for his departure.
Trade unions, representing about 30 percent of the labour force, have been protesting against the ruling Ennahada party.
Local Sahrawis complain of abuses and say international community has ignored their plight under Moroccan rule.