Nigeria's president vows to take the fight to 'Boko Haram and mischief makers'

Nigeria's President Muhammadu Buhari, in an address to the nation after returning from London where he spent more than three months for medical treatment, said his government will reinvigorate its campaign against the Islamic extremist insurgency in the country's northeast.

"Terrorists and criminals must be fought and destroyed relentlessly so that the majority of us can live in peace and safety," said Mr Buhari in a televised speech on Monday.