People attend a flag raising ceremony at a middle school in Yuen Long of New Territories, Hong Kong, south China, Aug. 11, 2019. The Association of Hong Kong Flag-guards held a flag raising ceremony at a middle school on Sunday. (Xinhua/Wu Xiaochu)

A flag raising team formed by several middle schools escorts the Chinese national flag during a flag raising ceremony at a middle school in Yuen Long of New Territories, Hong Kong, south China, Aug. 11, 2019. The Association of Hong Kong Flag-guards held a flag raising ceremony at a middle school on Sunday. (Xinhua/Wu Xiaochu)

A member of the flag raising team is seen at a middle school in Yuen Long of New Territories, Hong Kong, south China, Aug. 11, 2019. The Association of Hong Kong Flag-guards held a flag raising ceremony at a middle school on Sunday. (Xinhua/Wu Xiaochu)

People sing a song during a flag raising ceremony at a middle school in Yuen Long of New Territories, Hong Kong, south China, Aug. 11, 2019. The Association of Hong Kong Flag-guards held a flag raising ceremony at a middle school on Sunday. (Xinhua/Wu Xiaochu)