Nigeria's historic moment as President Buhari sworn in

Muhammadu Buhari has been sworn in as Nigeria's president, promising to bring "increased prosperity" to Africa's most populous country.

He is the first opposition figure to win a presidential election in Nigeria since independence in 1960.

He vowed to tackle "head on" the issues of corruption and the insurgency from militant Islamist group Boko Haram.

Will Ross reports.