Nigeria is struggling with its first recession in 25 years and critics say Buhari was slow to respond to the crisis.
The Nigerian government on Thursday announced that Boko Haram had released 21 of the more than 200 Chibok schoolgirls kidnapped in 2014.
Abu Musab al-Barnawi's promise to end the violence wrought on Muslim civilians may revive the terrorist organisation.
The statement did not explicitly say whether the Nigerian army considered the man in the video to be Shekau.
Buhari says his administration would be willing to conduct talks with the help of mediators if insurgents do not wish to deal with government directly
Details emerging from Nigeria point to senior Boko Haram officials killed, and their leader seriously wounded, but the claim hasn't ruffled the group.
Armed group wants Nigerian government to release their fighters from prison.
There were 171 terrorist attacks and 541 deaths in Africa in 2009. In 2015 that had risen to 4,600 deaths from 738 militant attacks
Dozens of Boko Haram members were killed and wounded while 30 Nigerien and two Nigerian soldiers died and another 67 got injured during the attack
In addition to an economy battered by falling oil prices, Nigeria is also now facing the rise of violence in more parts of the country
No soldiers died and 46 hostages were freed, including 18 women and 28 children, according to the statement
The jihadist militants have been "diminished and forced to retreat", but not defeated yet
Buhari losing it? Nigeria oil output hits 22-year low on renewed unrest, and the fuel queues are back
Upsurge in attacks also linked to corruption charges against a former rebel leader nicknamed Tompolo, accused of defrauding state of $225 million
Could sell Nigeria a dozen A-29 Super Tucano ground attack planes of the type US has supplied to Afghanistan to help it strike Taliban guerrillas
Buhari's new headache: Nigerian oil rebels 'blow up' facility operated by US firm Chevron in Delta state
"A previously unknown group called the Niger Delta Avengers has claimed responsibility for the incident," spokesman says
Nigeria says $15 billion stolen in security scams by Jonathan govt, three times more than earlier estimates
The looted amount “is more than half of the current foreign reserves" of Africa's largest economy
The number of fatalities and injuries rose 190% in 2015 from the previous year, while the use of human bombs rose 167%
Profile: Chad President Deby—current African Union chief is a warrior leader who enjoys near-blind western backing
Veteran leader this week won a fifth term in office, extending his 26 years in power--but not all are impressed.
Daring vendors exploit the group's need for fuel sell a 25-litre jerrycan for $250-$350 each; a mark-up of nearly 2,600% from $13