Among those arrested since Feb. 6 was a prominent Boko Haram member called Kaka Bounou.
Presidential candidate Muhammadu Buhari drew thousands Monday at a rally in Borno state, where he pledged to wipe out Boko Haram.
Most of those killed were children selling peanuts or begging for money.
Pakistan is one of three countries where polio is still endemic.
Explosions and gunfire could be heard after the fighters overwhelmed a checkpoint at the edge of the city.
After a boom in cocoa prices last year, Valentine's day chocolates may be more expensive than ever -- but not for long.
Boko Haram continues to attack villages in northeastern Nigeria, but it's also pushing into neighboring countries.
At least five civilians were killed in the Nigerian insurgent group's first attack inside chad early on Friday.
The latest Boko Haram attack, carried out by a female, reportedly killed at least seven people in the city of Biu, in Borno state.
The government has said the crackdown is part of a campaign to ensure that foreigners do not participate in the closely fought vote.
According to the latest Press Freedom Index, the U.S. also witnessed attempts to control journalists amid an ongoing "war on information."
The Nigerian military said it couldn't guarantee an election commissioner's safety unless the vote was held back for six weeks.
The news of Boko Haram deaths came as Niger officials declared a 15-day state of emergency in border city Diffa.
The insurgency in the northeast is causing chaos ahead of the postponed election, but so is the oil price plunge.
"Amass all your weapons and face us. We welcome you."
The education activist urged Nigeria's incoming government to make rescuing the girls a priority.
Nigeria and four neighboring countries will field the force in an attempt to halt Boko Haram's insurgency.
The president and legislative elections will be pushed back six weeks to give a multinational force time to fight Boko Haram militants.
The Dalai Lama did not speak, but Obama called him "a good friend." despite China's protests.
The country’s military is the primary backer of a postponement, arguing that it would allow them more time to fight Boko Haram.
This isn't the first time the militant group has employed the tactic.
Ahead of Nigeria's elections, Boko Haram is stepping up its campaign of violence — and using women to carry it out.