Two men being held on suspicion of involvement in the murder of a family of four in Fukuoka in June have admitted killing them, China's Public Security Ministry said Wednesday.

Wang Liang, 21, and Yang Ning, 23, who were students in Japan, have told authorities that they killed the four, whose bodies were found in June in Hakata Bay, ministry officials said.

The bodies of Shinjiro Matsumoto, a 41-year-old clothing merchant from the city of Fukuoka; his 40-year-old wife, Chika; 11-year-old son, Kai; and 8-year-old daughter, Hina; were found June 20 in the bay, handcuffed and weighted down by dumbbells.