The Franklin Health Department is investigating an illness that appears connected to a wedding last weekend. The bride’s parents told Today’s TMJ4 they feel terrible that the wedding guests became so ill, including the bride and groom.

At least 20 people came down with symptoms including nausea, vomiting, diarrhea, and abdominal cramps, according to the health department. The bride’s parents said they believe the number of victims may actually be much higher than 20.

The health department said it was unclear whether the illness came from food consumed at the wedding reception or some other location guests visited over the course of the weekend. The Franklin Health Officer said the department will contact guests who may have come in contact with the illness.

One health official, who is not connected to this investigation, questioned whether the illness could be norovirus which has recently spiked in northern Illinois.