The Minnesota Health Department is investigating a foodborne illness that sickened at least 75 people who ate at a banquet for Totino Grace football players Sunday in Brooklyn Park.

The banquet was attended by 273 people at the Edinburgh USA Golf Course clubhouse restaurant. Jeff Ferguson, football coach at the private Roman Catholic school in Fridley, said at least 41 adults and 34 students fell ill. “I think it was food poisoning. They got sick over a period of two days,” he said.

State health officials suspect that the illnesses were caused by norovirus because of the victims’ symptoms, which included vomiting and diarrhea, Health Department spokesman Doug Schultz said Thursday.