Vietnam is pouring police into major city streets to block mounting anti-China riots. China has sent five ships to retrieve its citizens, and state media reports that about 4,000 have already been evacuated. Vietnamese police made several arrests in Hanoi and Ho Chi Minh City as protesters prepared to launch a new wave of demonstrations against Beijing’s provocative installation of an oil rig in a disputed part of the South China Sea. China has reported two deaths and up to 100 injuries. Vietnam is stepping up efforts to control the situation, hoping to assuage mounting anxiety among foreign investors.