More than 50 migrants have died or disappeared off the coast of Tunisia, 33 others were rescued by workers from an oil platform, the Tunisian government said Tuesday.The Tunisian authorities report that the boat carrying migrants capsized Monday off Sfax, on Tunisia’s southeast coast. Flavio Di Giacomo, a spokesperson for the Mediterranean coordination office of the International Organization for Migration, said on Twitter that the 33 survivors were all from Bangladesh. The boat departed from Zawara. Riadh Kadhi, spokesperson for an International Organization for Migration, said the survivors reported that the boat carried about 90 passengers when it left Libya.