MITO, Ibaraki Pref. (Kyodo) A police sergeant was arrested Friday on suspicion of beating a man who had warned him against smoking on a train in Ibaraki Prefecture, police said, adding he regrets his actions.

Hideo Kuwahara, 50, was smoking on the deck between cars on a JR Joban Line limited express train Thursday evening when a 56-year-old office worker complained to him about smoking in what is a designated nonsmoking area, according to police.

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