The Thunder Bay health unit wants to hear from people who bought food at Bento Sushi in the Real Canadian Superstore in Thunder Bay, Ont., on March 28.

The health unit stated in a written release Wednesday that it is investigating cases of suspected foodborne illness after four people who purchased sushi at the Bento location in the Superstore in the city fell ill within four to five hours of eating it.

The reported illness was characterized by vomiting, diarrhea and weakness and lasted approximately 24 hours.