Dozens of workers from sub-Saharan Africa are feared killed, and hundreds are in hiding, as angry mobs of anti-government protesters hunt down "black African mercenaries," according to witnesses… Hundreds of black immigrants from poor African countries, who mainly work in Libya’s oil industry as cheap labourers, have…been injured in the violence. Some were unable to seek medical treatment for fear of being killed…About 1.5m Sub-Saharan African migrants work in Libya as low-paid labourers in the oil industry, construction, agriculture and service sectors. Rights organisations say some anti-Gaddafi protesters wrongly associate African workers with state-sponsored violence…Ignored by their governments, African workers are one of the most vulnerable groups in Libya right now.