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.
Some 7.4 million Nigeriens were registered to vote to elect legislators and the successor to President Mahamadou Issoufou.
The 57-member Organisation of Islamic Cooperation asks India to refrain from altering the demographic structure of India-administered Kashmir that India unilaterally annexed last August, Pakistani foreign office says.
"Boko Haram terrorists" raid Blabrine military base in troubled Diffa region leaving another 10 soldiers wounded, defence ministry says in statement.
The former French colony in the Sahel region of Africa, Niger, is looking to rid its national anthem of any remnants of French colonisation.
The tanker truck exploded overnight as crowds tried to collect spilt fuel in Niger's capital Niamey, authorities and witnesses said on Monday.
Defence ministry says more than 200 militants were killed in air strikes and a further 87 by ground troops since a military offensive began on December 28.
Niger's minister for humanitarian action says floods have killed at least 22 people, destroyed more than 3,000 homes and nearly 4,000 hectares of crops.
Smugglers abandon 34 refugees including 20 children in Niger desert close to Assamaka.
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