Luxury Italian fashion brand Gucci has been accused of being a “sweatshop” by five people who used to work in the company’s store in Shenzhen.

China Daily reported that the former employees had complained of having to work overtime without adequate compensation, and of having to get permission to go to the bathroom or have a drink of water.

In an open letter, the ex-workers said they had had to stay on until 2am or 3am to conduct inventory checks, and had seen their salaries cut when items left in their charge were found to have vanished.

According to reports in Beijing, Gucci has so far declined to comment on the reports, except to say that it is investigating the allegations.

Gucci and parent company PPR failed to respond to just-style’s request for comment on the story.