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.
Boko Haram accused of storming a predominantly Christian village in Borno after security agencies warned the country of an increased risk of attacks during the Christmas holiday.
Boko Haram reportedly claimed the kidnappings but parents are less concerned about who was behind the abductions as they reconsider sending their children back to school.
The foiled abduction in Nigeria's northwestern Katsina state comes less than two days after the release of 344 schoolboys, who were kidnapped in the same area last week.
A teenage girl sets off her explosives among a group of men at a hangout next the local chief's home, according to a militia leader.
The boys will undergo a medical examination before being reunited with their parents.
The release comes hours after Boko Haram terror group released a video purportedly showing some of the more than 300 schoolboys abducted last week from a government boarding school in the northwestern town of Kankara.
Parents fear time may be running out for their sons as Boko Haram has a history of turning captives into militant fighters.
Meanwhile, Boko Haram has claimed responsibility for the abduction of the students – more than 300 boys – from northern Katsina State.
More than 300 students are missing after gunmen stormed the Government Science School at Kankara late on Friday and engaged security forces in a fierce gunbattle, forcing hundreds of pupils to flee and hide in surrounding bushes and forest.
An armed group with AK-47s, stormed the Government Science secondary school in Kankara district which led to a shootout between the gunmen and security forces.
The Western multinational finds itself in the eye of the storm after its employees were found to be spilling oil to earn illicit money cleaning it up.
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