Nigeria’s government says President Muhammadu Buhari will fly through London on his way home from next week’s United Nations gathering of world leaders, raising more questions about his health.

Presidential spokesman Femi Adesina gave no details about the London stop in a statement Friday. The 74-year-old president twice this year has spent several weeks in London for medical treatment, returning in August from three months away.

Buhari has not said what was ailing him but once said he had never been so sick in his life.

This will be the president’s first trip outside Nigeria since his return in August.

Friday’s statement says Buhari will meet with President Donald Trump and other leaders during the U.N. gathering in New York.