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Muhammadu Buhari has been sworn in for a second term as president of Nigeria at a ceremony in the capital, Abuja.

The president took his oath of office in traditional dress - simple white robes and an embroidered hat.

"I do solemnly swear that I will be faithful and bear true allegiance to the Federal Republic of Nigeria," he said. "I will preserve, protect and defend the constitution."

Mr Buhari's to-do list includes reviving a weak economy and tackling rampant corruption and insecurity.