Gambia’s longtime leader Yahya Jammeh has asked the West African bloc ECOWAS for an extension of a midday deadline for him to leave power until 4 p.m. local time (1600 GMT), government sources said on Friday. Guinea’s President Alpha Conde and Mauritania’s President Mohamed Ould Abdel Aziz arrived in the Gambian capital Banjul on Friday for last-ditch talks with Jammeh, witnesses said.