Nigeria's ailing president returns after 3 months away

Nigerian President Muhammadu Buhari returned to the country Saturday after more than three months in London for medical treatment but the government gave no details on what has been ailing him.

Buhari will address the nation in a broadcast Monday morning, his office said, referring to the president's issues merely as a "health challenge."

The 74-year-old leader also spent seven weeks in London for treatment earlier this year, saying he had never been so sick in his life. He spoke of receiving blood transfusions.

Buhari's long absences have led some in Africa's most populous nation to call for his replacement and for the military to remind its personnel to...