Dozens of people suffer from symptoms similar to those of norovirus after attending a huge Lego event in Bristol this weekend.
The organizers of the Bristol Brick show say they are "devastated" and an investigation has been opened by the health authorities of the city.
Nearly 4,000 people visited the Action Indoor sports center to celebrate Lego, but after the event, more than 40 people began to suffer from illness and diarrhea.
A Lego fan, who wishes to remain anonymous, said that he was not satisfied with the cleanliness of the room.
He said: "The inventory leaves a lot to be desired."
"The food was not excellent and during the weekend the toilets were not well maintained, the ponds did not work well and there was no hand sanitizer and that sort of thing."
"At least 40 people I know have been affected."
The Bristol Brick Show posted a post on his Facebook page on Wednesday afternoon, in which it was written, "Thank you all for coming to our show, for appreciating it and for helping us to raise money for two charities.
"We were informed that a number of people who attended our event this weekend have since been affected by a virus.
"Unfortunately, no case of illness was reported during the show. So we had no way to warn anyone or identify a source at the time.
"Many of you know that Bristol has recently been confronted with several cases of Norovirus infection in schools, hospitals and other businesses in the area. The combination of this problem and nearly 4,000 people through our doors over the weekend seems to have contributed to an epidemic.
"We organized the same event last year at the same place without any known problems. We are therefore convinced that it is an unfortunate and isolated incident.
"As organizers, we are devastated by the fact that it has put a damper on an otherwise successful exhibition. We wish all those affected a speedy recovery.
"Thank you for your continued support and we hope that your memories of the show will not be affected by these events!"