Dozens of Government employees suffered food poisoning after ordering Indian snacks from a Leicester restaurant to celebrate Diwali in 2017.
Officials at Leicester City Council launched an investigation after 40 staff members, out of 180 who sampled the food, fell ill.
The incident has been outlined in a report showing the work carried out by the council’s food hygiene inspectors.
The identity of the restaurant has not been revealed, nor has the council said which Government department was affected.
The council told Leicestershire Live it was unable to disclose any more details about the incident.
However, those affected could be employed by HM Revenue & Customs, based in Saxon House, Causeway Lane, in the city centre.
The council said leftovers were were taken for microbiological examination, and a stool sample from one of the victims was also analysed.
Some of the food items contained high levels of the Clostridium perfringens toxin, a bacterium which is a common cause of food poisoning.
The specimen of faeces also tested positive for enterotoxin, a toxin produced by bacteria in the Clostridium family.
