The Amnesty International says Nigerian government under the leadership of President Buhari is trying to muzzle dissent by arresting and intimidating journalists and protesters.
According to the London-based human rights group, it cites examples of police blocking peaceful protests. Those protests include activists demanding the government rescue more than 200 kidnapped Chibok schoolgirls, Shiite Muslims demanding the release of their long-detained leader and separatists calling for an independent Biafra in the southeast.
The statement Wednesday says Amnesty has documented cases of enforced disappearances and killings of pro-Biafra supporters by security forces.
It also cites the detention of several journalists critical of officials in the government of President Muhammadu Buhari.
Amnesty urges the government to halt detentions without trial and the excessive use of force.