Thousands of sub-Saharan migrants have huddled in Tunisian olive groves for months, living in makeshift tents and surviving on meagre rations while keeping their hopes alive of reaching Europe.
Around 20,000 are in isolated areas near the towns of El Amra and Jebeniana, some 30 and 40 kilometres (19 and 25 miles) north of the port city of Sfax, humanitarian sources say.
