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Police on Tuesday arrested a 61-year-old Kapolei man who allegedly struck his 25-year-old son during an argument Monday.
Police said the father and son were arguing 1 p.m. Monday when the father allegedly hit the son.
The son received substantial bodily injury, and was treated at a nearby hospital, then released.
The son reported the assault to the police Tuesday.
Police arrested the father 4:35 p.m. Tuesday on suspicion of second-degree assault.