At least 40 people are said to have died while 30 were rescued after a vessel sank near the city of Mahdia At least 40 people have drowned and 30 others were rescued after a migrant boat sank off the coast of Mahdia, Tunisia, on Wednesday morning, local authorities have said.   The iron boat, carrying around 70 sub-Saharan migrants, capsized near Salakta, a coastal town in Mahdia governorate.   A local news agency citing the statement of Walid Chtiri, spokesperson for the Mahdia Primary Court,