Hundreds of people are thought to be missing after a ferry sunk off the coast of Zanzibar with some 600 people onboard. About 380 people are believed to be missing, local officials say.At least 220 are reported to have been rescued, they say.One survivor said the ferry, MV Spice Islanders, was heavily overloaded and sank in an area with heavy currents in deep sea between mainland Tanzania and Pemba Island early on Saturday. From/ BBC