Parents participate in a rally to voice their opposition to violence and call for campus safety in south China's Hong Kong, Sept. 22, 2019. (Photo: Xinhua)

Parents participate in a rally to voice their opposition to violence and call for campus safety in south China's Hong Kong, Sept. 22, 2019. (Photo: Xinhua)

Parents participate in a rally to voice their opposition to violence and call for campus safety in south China's Hong Kong, Sept. 22, 2019. (Photo: Xinhua)

Parents participate in a rally to voice their opposition to violence and call for campus safety in south China's Hong Kong, Sept. 22, 2019. (Photo: Xinhua)

 

 

Parents participate in a rally to voice their opposition to violence and call for campus safety in south China's Hong Kong, Sept. 22, 2019. (Photo: Xinhua)

Parents participate in a rally to voice their opposition to violence and call for campus safety in south China's Hong Kong, Sept. 22, 2019. (Photo: Xinhua)

Parents participate in a rally to voice their opposition to violence and call for campus safety in south China's Hong Kong, Sept. 22, 2019. (Photo: Xinhua)