BEIJING: China's coast guard held a National Day flag-raising ceremony on a ship in the waters off the disputed Scarborough Shoal, vowing to "stand guard" over the atoll, a major flashpoint for diplomatic flare-ups and maritime clashes with the Philippines. Both countries claim the triangular feature in the busy waterway of the South China Sea , but it is effectively under Beijing's control. In September, China infuriated Manila with a plan to set up a "national" nature reserve there . Coast