Police said Friday they have turned over to prosecutors their case against seven men who stripped naked last December at a Chinese restaurant in the city of Kanazawa, Ishikawa Prefecture, on suspicion of forcible obstruction of business and public indecency.

The seven men in their 20s and 30s, who worked for an adult entertainment shop in the city, allegedly sat on chairs with nothing on at the dumpling restaurant run by Ohsho Food Service Corp. and took pictures of themselves despite warnings by restaurant staff, the police said.

The men stand accused of obstructing business because there were other customers at around 9:30 a.m. last Dec. 8, they said.

The seven have told investigators the restaurant had given permission to their plan to produce a poster for the adult entertainment shop with the pictures taken at the outlet. A picture showing some of the men naked was later posted online.

Ohsho Food Service closed the restaurant in Kanazawa, saying it was "unacceptable to continue its service" as it could cause "customers to feel discomfort." The Kyoto-based company filed a criminal complaint against the men in September.