Hong Kong police on Sunday confirmed the arrest of the organizer of an unauthorized rally in Yuen Long of Hong Kong's New Territories.

Chung Kin-ping, the organizer of the event, was among the 13 people the police have arrested so far, according to Yu Hoi-kwan, a spokesperson of the Hong Kong police.

"He clearly understands that police objects (to) this event, and also the appeal board supports the police decision that this is a prohibited public meeting, and we object to the public procession as well," said Yu when she explained the reason of the arrest.

"But he remained present in the event, so based on the behaviors of him we arrest him," Yu told reporters.

Read more: 

Violence in HK: Injuries, arrests, worries and wishes

HKSAR gov't, police condemn violence in unauthorized protest in Yuen Long

Thousands of demonstrators gathered in Yuen Long Saturday despite a police ban.

The government of China's Hong Kong Special Administrative Region (HKSAR) strongly condemned the violence as "breaching the public peace and breaking the law deliberately" on Sunday. "The police will take serious follow-up actions with those violent protesters," it stressed.