TO GO WITH AFP STORYIllegal immigrants sit at the back of a pick up truck after leaving the city of Gao, northern Mali, 16 November 2006, on their way to the Algerian border. Gao is one of the transit cities where illegal immigrants from Sub-Saharan African countries start their clandestine emigration towards Europe. AFP PHOTO GEORGES GOBET(Photo credit should read GEORGES GOBET/AFP/Getty Images)