The biggest party in the world is under way as Rio de Janeiro's mayor handed over the key to the city to its Carnival monarch on Friday, opening King Momo's five-day reign over the festivities. Taking ...

With colourful costumes decorated with feathers and glitter, Rio de Janeiro's samba schools paraded at the Sambadrome on the first day of Carnival. #rio #carnival ...

Carnival revelry is ramping up, from the raucous street parties to the glitzy parades. Follow AP reporters and photographers ...