Vietnam announced plans to evacuate more than half a million people and ordered boats to stay ashore, while the southern Chinese city of Sanya closed businesses and public transport on Sunday as both braced for an intensifying Typhoon Kajiki.

The storm is forecast to "brush past" the southern coast of China's island province of Hainan from Sunday evening before heading for Vietnam, China's National Meteorological Center said.

As of 0900 GMT, the storm had gained strength, with winds reaching 166 kph (103 mph), according to Vietnam's national weather forecast agency.

It is likely to strengthen further with wind speeds as high as 180 kph, China's weather forecaster said.

Authorities in Vietnam plan to evacuate more than 586,000 people from the central provinces of Thanh Hoa, Quang Tri, H

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