CAIRO (AP) — A rubber boat carrying dozens of Europe-bound migrants sank off the coast of Libya and at least 55 people drowned, including women and children, the U.N. migration agency said Wednesday. It was the latest tragedy in this part of the Mediterranean Sea, a key route for migrants. The agency said five migrants survived the shipwreck and were brought back to shore by the Libyan coast guard. The was the latest tragedy in the central Mediterranean Sea, a key route for migrants. Human traffickers in recent years have benefited from the chaos in Libya, smuggling in migrants across the country’s lengthy borders with six nations.