Former military ruler Muhammadu Buhari has formally been sworn in as Nigeria's next president after he defeated President Goodluck Jonathan in March 28 elections.
Buhari, who was sworn-in in the captial city of Abuja on Friday, is the first Nigerian to oust a sitting president through the ballot box.
Dressed in traditional Muslim attire, Buhari stood on the stage clutching a Quran in his right hand, as he pledged to uphold the constitution and laws of Africa's most populous nation.