The 76-year-old leader was sworn in on Wednesday amid tight security in the Nigerian capital Abuja. He did not make a speech during the low-profile event attended by members of the diplomatic community.
Buhari, a former military ruler, won 56 percent of the votes to defeat his main challenger, former Vice President Atiku Abubakar of the Peoples’ Democratic Party (PDP) in the February election, which had been beset by a host of security and logistic issues that delayed the vote by a week.
Following the announcement of the election results, Abubakar filed a petition against the outcome, a process that is ongoing in Nigeria’s appellate court.
Buhari will face a number of challenges during his second term as he tries to fulfil his election promises, including dealing with security threats and managing a sluggish economy and a high unemployment rate.