The ISIS-linked group, while holding less territory, has remained a deadly rival to the country's government.
Ethnic tensions have been on the rise after a northern Nigerian group called for the expulsion of Igbos, an ethnic group that made up the majority of the population of Biafra.
The rights group claimed that nine senior commanders had overseen torture and abuses that led to some 8,000 deaths.
Eighteen charges of non-declaration of assets against Saraki, the head of Nigeria's senate, were dismissed after almost two years of legal wrangling.
Yemi Osinbajo called for an end to incitement after a call for ethnic cleansing that evoked the Biafran war, in which 1 million people were killed.
The West African country has been in recession since mid-2016.
Fifty years ago, Nigeria fought a brutal civil war based on ethnicity and secession. Those tensions continue to simmer.
A coalition of northern Nigerian groups called for the expulsion of Igbos, an ethnic group that largely supported the Biafran side in the 1960s civil war.
Muhammadu Buhari has been out of the country for almost three months in 2017 as Nigeria battles recession and insurgency.
Nigeria's trade minister says the country could be a springboard for U.S. businesses in Africa, predicting good relations under President Trump.
The government is yet to secure a high-profile conviction for graft.
Sixty people were killed during last year's protests to mark the anniversary of Biafran independence, according to the rights group.
Norway sold seven decommissioned warships to a militant leader in Nigeria's oil basin, and the U.K. facilitated the sale.
Christian pastor Yemi Osinbajo is Nigeria's acting president while Muhammadu Buhari is on sick leave.
Officials have stolen $15 billion in federal defense funds, resulting in an army that is ill-equipped and unprepared.
A Nigerian governor planned to shut all IDP camps in his state by June, but 1.4 million people remain displaced by the Islamist insurgency.
83 of the girls were to be released in a prisoner swap, but one said she was "happy" in Boko Haram captivity.
Boko Haram released 82 more girls, but global scrutiny and a long rehabilitation program means freedom may yet prove elusive.
Muhammadu Buhari spent nearly two months in London for treatment for an unknown condition earlier in 2017.
While a fragile truce is allowing Nigeria to step up oil output, a resolution of the crisis is unlikely without further concessions.
Arik Air stopped flying to Maiduguri, the birthplace of the jihadi group, in December 2013.
Muhammadu Buhari, 74, has rarely been seen in public since returning from seven weeks of sick leave in March.
Buhari has missed several cabinet meetings and is still recovering following a months-long absence in the U.K.
Buhari returned in March from a two-month medical absence in the U.K.
"My concern is whether we have cut and past a framework that doesn't work for Africa," says Amina Mohammed.