Many women and children are among 150 people that drowned after a ship carrying some 850 migrants, including Pakistanis and Bangladeshis, fleeing the conflict in Libya capsized off Tunisia's coast, the United Nations refugee agency said. The tragedy appears to be one of the worst and the deadliest incidents in the Mediterranean so far this year, said Adrian Edwards, the spokesman for the UNHCR.The Geneva-based agency said at least 578 of the estimated 850 people on board, mostly from West Africa, Pakistan and Bangladesh, survived the Wednesday sinking. The boat, manned by people with little or no maritime experience, set sail on Saturday afternoon from the Libyan capital Tripoli and was headed for Lampedusa in Italy, Edwards said."It ran into difficulties soon after departure and experienced problems with its steering and power," he said.