Japanese police have arrested three people over "sushi terror", the viral unhygienic prank which is threatening sushi conveyor belt restaurants.
Last month, a teenager was captured licking the open top of a communal soy sauce bottle and rubbing saliva on passing food at a kaitenzushi (conveyor belt sushi) restaurant.
Since then, dozens of similar videos have been filmed, sparking widespread outrage and causing restaurants to scramble to restore their reputation for cleanliness.
