Mahama attends Adama Barrow's inauguration
The inauguration also coincides with the 52 years of the west African country's independence.
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Mr Barrow was sworn into office in The Gambian Embassy in Dakar, Senegal last month after the then leader, Yayha Jammeh, refused to leave office.
Jammeh bowed to pressure from regional leaders who had threatened to use military force if he refused to leave office.
He went into exile in Equatorial Guinea.
Barrow is the third president in the history of the Gambia.
A statement from the ex-president's office, signed by Joyce Bawah Mogtari, said Mr Mahama will attend the inuaguration.
"Former President John Mahama was an ECOWAS Co-Mediator in the efforts towards resolving the election dispute that followed the December 01, 2016 election," the statement added.
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