Vietnam plans mass evacuation, China's Sanya shuts as Typhoon Kajiki intensifies

The storm, packing winds of up to 149 kph (93 mph), was about 500 kilometres (300 miles) off Vietnam's central coast at 06:00 GMT, moving west at 20 kph, according to Vietnam's national weather forecast agency.

It is likely to strengthen with wind speeds as high as 170 kph (110 mph), 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, Hue and Danang, where the typhoon is forecast to make landfall early on Monday, state media reported.