The "Safeguard Hong Kong" massive rally is held in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence. (Photos: Xinhua)

The "Safeguard Hong Kong" massive rally is held in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

Local residents take part in the "Safeguard Hong Kong" massive rally in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

In this aerial photo taken on July 20, 2019, the "Safeguard Hong Kong" massive rally is held in south China's Hong Kong. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

In this aerial photo taken on July 20, 2019, the "Safeguard Hong Kong" massive rally is held in south China's Hong Kong. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

People hold a large banner during the "Safeguard Hong Kong" massive rally at Tamar Park in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

People take part in the "Safeguard Hong Kong" massive rally at Tamar Park in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

People take part in a massive rally at Tamar Park in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the "Safeguard Hong Kong" massive rally here on Saturday to support the rule of law while opposing the use of violence.

Local residents hold banners during the "Safeguard Hong Kong" massive rally at Tamar Park in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

People take part in the "Safeguard Hong Kong" massive rally at Tamar Park in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

Local residents take part in the "Safeguard Hong Kong" massive rally in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.

Local residents hold banners during the "Safeguard Hong Kong" massive rally at Tamar Park in south China's Hong Kong, July 20, 2019. Over 300,000 people attended the massive rally here on Saturday to support the rule of law while opposing the use of violence.