China is sending five ships to evacuate Chinese nationals from Vietnam following a wave of anti-Chinese riots.
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The Chinese government has already evacuated more than 3,000 people, Chinese state-run media report.
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The first ship set sail on Sunday, while 16 critically injured Chinese nationals left Vietnam on a chartered flight.
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Two Chinese workers have been killed and dozens more injured in unrest over a Chinese oil rig in disputed waters.
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On Saturday the Vietnamese government called for an end to the protests.
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Officials said "illegal acts" would be stopped as they could damage national stability.
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However, dissident groups have urged people to rally again in major cities on Sunday and the authorities broke up some anti-China protests in Hanoi and Ho Chi Minh City.Â