Libya has become an important transit point for migrants, but since 2011, conflict has also driven many Libyans and foreign workers from the country. Roughly 300,000 people ended up at a UN refugee camp just across the border in Tunisia. By the time the camp closed in 2013, some had received refugee status; many others were repatriated. But several dozen Africans, whose asylum applications were rejected, refused to leave. Lisa Bryant reports.