South Korean ship Maputo 9 (L) is escorted by a Yemeni coast guard boat at the southern Yemeni port of Aden November 13, 2007. Two South Korean ships, Maputo 7 and Maputo 9 arrived in Aden on Tuesday after they were freed on November 5, 2007 by Somali pirates who had hijacked them last May. REUTERS/Khaled Abdullah (YEMEN)