In Bangladesh and Myanmar a powerful cyclone is hitting the coastlines after intensifying into the equivalent of a category-five storm.

Cyclone Mocha is bringing heavy rain and winds which could see dangerous flooding on land around the Bay of Bengal.

There are fears it may hit the world's largest refugee camp, Cox's Bazar, where nearly one million people live.

Forecasters warned Cyclone Mocha con be the most powerful storm seen in Bangladesh in nearly two decades and around 500,000 people have been evacuated to safer areas.

UN Humanitarian Coordinator A.I Ramanathan Balakrishnan said, for a cyclone to hit an area where there is already such deep humanitarian need is a nightmare scenario, impacting hundreds of thousands of vulnerable people whose coping capacity has been severely eroded by successive crises.