Hong Kong police arrested eight people late Thursday and early Friday during a raid in an industrial building in Sha Tin, police said in a statement.

Seven males and one female, including Chan Ho-tin, convener of the "Hong Kong National Party," which has been banned from operating in accordance with law, were arrested Thursday during the raid, Acting Senior Superintendent Chan Yan, deputy district commander of Shatin District, told a media briefing Friday.

During the raid, softball bats, loudspeakers, protective garments, petrol bombs, bows and arrows were seized, which, according to the police, were objects frequently seen at the sites of the recent violent protests.

The police suspected the case was related to the series of violent incidents that happened in the Hong Kong Special Administrative Region recently.