Police on Tuesday arrested five individuals including four teenagers after the body of a 17-year-old boy with Chinese nationality was found in a central Japan lake earlier this month.

The five are Neo Horiuchi, 21, from Hamamatsu, Shizuoka Prefecture, an 18-year-old man with Philippine nationality and three 17-year-old boys, including one with Brazilian nationality. They were arrested on charges including assaulting Ukawa Saito, who was enrolled at a correspondence high school.

The police are investigating the relationship between the five and the victim.

An autopsy has indicated that Saito was drowned, with his body bearing multiple bruises.

Saito, who lived in Fukuroi, a city in western Shizuoka Prefecture, was reported missing by his family on Feb. 7 and his body was found two days later by an angler at Lake Hamana, also in the western part of the prefecture.

Photo taken Feb. 13, 2024, shows the area in Shizuoka Prefecture, central Japan, where the body of a high school boy was found earlier, with Lake Hamana in the background. (Kyodo)

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Body of 17-year-old boy found in central Japan lake, murder suspected