Hong Kong fishing vessel Kai Fung No 2 reaches Hong Kong on Wednesday morning.
A spokesperson for the Hong Kong Special Administrative Region (HKSAR) government said Chief Executive CY Leung and HKSAR government are pleased to see the safe return of Kai Fung No 2 and seven Diaoyu activists on board.
Fourteen Chinese arrived at the Diaoyu Islands via Kai Fung No 2 on August 15 to assert China's sovereignty over the islands and were subsequently detained by the Japanese coast guard. Seven of them were released and flew back to Hong Kong on August 17.
The spokesperson said that the Diaoyu Islands have been China's territory since ancient times and the Japanese side's detention of Chinese citizens, including Hong Kong residents, was illegal and invalid.
The HKSAR government has attached great importance to the incident and cooperated closely with the Office of the Commissioner of the Ministry of Foreign Affairs in Hong Kong.
The Immigration Department sent officers to Japan on August 15 to join officers of the Hong Kong Economic and Trade Office (Tokyo) in working with the Chinese Embassy and Consulates in Japan to render all practicable assistance to the persons concerned.