Yahya Jammeh, a man who has been accused of pillaging state coffers, lost elections in December but refused to step down after ruling the country for 22 years.
Adama Barrow was forced take oath at the Gambian Embassy in neighbouring Senegal last week, while his predecessor Yahya Jammeh refused to step down.
The incoming Gambian administration is accusing Yahya Jammeh of stealing millions of dollars and shipping out luxury goods on the night he left the country.
Jammeh's departure ends a political crisis that erupted on his refusal to step down following last month's election defeat.
Yahya Jammeh lost presidential elections but ignored multiple deadlines to quit, even as West African armies entered the country on Thursday to support new leader Adama Barrow.
Veteran Gambian leader Yahyah Jammeh has refused to concede the presidency after electoral defeat in December. Gambian government sources say the veteran leader has asked the ECOWAS group to extend the deadline for him to leave office until 1600 GMT.
The bloc gives long-time ruler Yahya Jammeh a final chance to hand over power to newly-inaugurated President Adama Barrow.
The UN Security Council is set to vote later on Thursday on a draft resolution endorsing the West African regional force's efforts to remove outgoing president Yahya Jammeh who has refused to step down.
Surrounded on all sides - Gambia's President Yahya Jammeh is clinging to power as neighbouring countries threaten intervention if he doesn't step down.
Nigerian Air Force says it has deployed men and air assets to forestall breakdown of law and order in Gambia.
Gambia's national assembly on Wednesday adopted a resolution to extend President Yahya Jammeh's term.
President Yahya Jammeh's refusal to concede election defeat and leave office after more than 22 years prompts concern at home and in the region.
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