Reports of deliberately unhygienic behaviour have risen in recent weeks, including an incident in which a diner drunk from a soy sauce bottle

Police in Japan have made several arrests after the country’s multibillion dollar revolving sushi industry was rocked by a spate of “sushi terrorism”, including a case in which a customer wiped saliva on food destined for other diners.

The Kyodo news agency reported on Thursday that three people – all part of the same group of diners – had been arrested on suspicion of forcible obstruction of business.