Police suspect involvement of a group of Vietnamese behind the disappearance of hundreds of pigs and chickens, as well as thousands of pears and peaches, from farms this year in eastern Japan.

In connection with a series of suspected thefts of livestock and fruits in the northern Kanto region near Tokyo, nearly 20 Vietnamese have been arrested on suspicion of overstaying their visas or slaughtering pigs at home without permission from authorities, according to the police.

Four male Vietnamese technical trainees ages 20 to 30 were arrested last month for allegedly cutting pigs into pieces at their apartment in Ota, Gunma Prefecture, around July.