Four people were arrested Tuesday on suspicion of murdering a 17-year-old male whose body was found in the Tegakawa River in Kashiwa, Chiba Prefecture.
Ryuta Sato was found naked at the bottom of the river four hours after the suspects called an ambulance at 6:10 a.m. Monday. They said their friend had drowned. Sato was later confirmed dead in a hospital.
The four suspects are Yohei Kojima, 22, a co-worker of Sato; Junta Okada, 20, a former colleague of Sato; Masumi Watanabe, 21, a friend of Okada; and a 19-year-old male whose name was not released because he is a minor.