Among the prisoners held by anti-Gadhafi rebels in western Libya are many sub-Saharan Africans --from Ghana, Chad and other countries. Rebel leaders have long accused Moammar Gadhafi of recruiting black African mercenaries. Interviews at a rebel prison appear to corroborate the allegations. The prisoners — Libyans as well as sub-Saharan Africans — say Gadhafi's army is running short of food and ammunition, and is plagued by desertions. NPR's Lourdes Garcia-Navarro reports.