The gun and bullets were bought from overseas websites and transported into Hong Kong via international delivery in a bid to avoid detection from the police, Chou said. The Hong Kong police will cooperate with overseas law enforcement agencies to plug the leaks.

Since October last year, the police have uncovered 14 cases related to explosives, seized high explosives, offensive weapons and some devices which can be detonated remotely, and arrested extremists who planted bombs in public places.

According to Hong Kong regulations, people convicted of possession of arms and ammunition without a license face up to 14-year imprisonment and a fine of HK$100,000 ($12,900).