Abubakar Shekau leads a faction of the Nigerian militant group after it splintered in 2016.
Several people have been killed in the blasts, one of which occurred at a university mosque.
The girls are studying at the American University of Nigeria in Yola.
Political change, separatist insurgencies and a possible genocide project a tough year for the continent.
Buhari's government has faced an economic crisis and major threats to stability.
The violence of ISIS and Al-Qaeda affiliates threatens to spread far beyond Nigeria and Somalia.
The extremist Islamist group has steadily lost territory over the last year.
Military is closing in on Sambisa Forest, the group's remote final stronghold.
A year ago, he said the same thing.
The U.S. has refused to sell military aircraft to Nigeria over alleged human rights abuses.
Sheikh Ibrahim Zakzaky was arrested after deadly clashes killed almost 350 of his followers.
After attacks across the region, Nigerian and regional military forces have forced Boko Haram into a remote hideout.
The U.N.'s humanitarian coordinator in Nigeria added that 75,000 children could starve.
The Nigerian Nobel Prize winner also said he would hold onto his green card—for now.
Boko Haram released 21 of the kidnapped girls last month.
Amnesty International has called on the country to overturn the sentences.
The Nigerian first lady previously said she may not campaign for her husband at the next election.
The kidnapping of women and girls is just one sign of a lack of gender equality in Nigeria
The ISIS-allied faction of Boko Haram is reportedly holding a large group of the girls.
The Nigerian government said the released girls were in state custody.
Maiduguri has been at the epicenter of the group's seven-year insurgency.
No group has yet claimed responsibility for the attack.