Mohamed Bazoum's inauguration as president marks first-ever transition between elected presidents in the African country's six decades of independence from France.
"Rogue" military unit tries to seize presidential palace in capital Niamey days before the historic inauguration of Mohamed Bazoum as president, sources say.
Authorities declared ruling party candidate Mohamed Bazoum winner of the run-off election but his rival, former president Mahamane Ousmane, has alleged fraud and also claimed victory.
Opposition leader Mahamane Ousmane claims he narrowly won the country's presidential election, as fresh violence erupts in capital Niamey.
Niger experts have warned that elections could see violence as the country battles rising militant attacks where thousands of people have been killed and hundreds of thousands displaced despite the presence of regional and international troops.
Ruling party candidate Mohamed Bazoum is seen by many as the favourite after leading in the first round on December 27 with 39.3 percent of the vote. Polling stations opened at 0700 GMT and will close at 1800 GMT (8 am to 7pm) local time.
Mohamed Bazoum will face former president Mahamane Ousmane, who won 17 percent of the vote, for the February 21 runoff in the West African country.
Some 7.4 million Nigeriens were registered to vote to elect legislators and the successor to President Mahamadou Issoufou.
Former interior minister Mohamed Bazoum, the ruling party's candidate, is the overwhelming favourite to succeed President Mahamadou Issoufou, who is stepping down after two five-year terms.
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