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Dozens of attacks have been recorded in Nigeria's northwestern region since the beginning of the year.
Casting doubt on the Nigerian government's claim that the Boko Haram is on the back foot, the terrorists attacked three military bases in northeast Nigeria and killed a soldier.
Oil prices edged up on Friday, recovering some of their steep losses made this week, but crude remained on course for its worst first-half decline in almost two decades.
The report by the Department of Economic and Social Affairs' Population Division forecasts that the current world population of nearly 7.6 billion will increase to 8.6 billion by 2030.
The first attack killed several people near a mosque, while five others were killed in a house.
Oil prices dropped to six-week lows on Thursday, under pressure from high global inventories and doubts about OPEC's ability to implement agreed production cuts.
Cameroon said its troops had rescued 5,000 civilian "hostages" held by Boko Haram Islamists in a cross-border operation that left scores of militants dead.
The Boko Haram insurgency has been blamed for more than 20,000 deaths and displacement of 2.3 million people since 2009.
Nigeria wants Royal Dutch Shell to reopen one of its main pipelines but the oil multinational is resisting, analysts say, for fear it could once again be bombed by militants.
However the co-owners of the pipeline denied the blast caused any deaths.
Two German archaeologists have been kidnapped in northern Nigeria while working at an excavation site.
The city is the birthplace of the Islamic insurgency and the headquarters of the military campaign to halt it.
Nigeria's military last year drove Boko Haram out of towns and forest strongholds, but isolated attacks and suicide bombings continue.
Narcotics Control Bureau(NCB) on Friday night arrested two African women with 4 kg cocaine worth rupees 30 crores from a hotel situated near IGI airport.