The suspect has reportedly admitted the allegations. PHOTO: AFP
Police arrested 73-year-old Yoshitane Yamasaki on suspicion of imprisoning his son, now aged 42, at their house in the city of Sanda in Hyogo prefecture, a local police spokesperson told AFP.
Further details of the case were not available as the investigation is still underway, the spokesperson said.
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According to local media reports, the son was forced to live inside a wooden cage -- one metre (3.3 feet) high and 1.8 metre wide -- built in a prefabricated hut next to the main house.
The suspect has reportedly admitted the allegations.
"I made my son live in a cage for more than 20 years because he has mental problems and acted up," the father earlier told city officials, according to public broadcaster NHK.
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The father said he fed his son and let him bathe every other day.
The son, whose name has been withheld, is in a stable condition but is suffering from a bent back, NHK said, adding that he was sent to a welfare facility.
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