A volunteer cleans a pedestrian bridge near Wan Chai metro station in south China's Hong kong, Sept. 1, 2019. Recently, Hong Kong had some chaotic nights when rioters threw petrol bombs, set fire on roads, hurled bricks and vandalized shops and metro stations. When residents go out the next morning, they will find few traces of the tumultuous nights on the streets. A group of volunteers known as the scar removers are among the many people who have contributed to the rapid tidying-up of the ravaged streets. (Xinhua/Mao Siqian)