A dozen people treated for gastrointestinal illness at CNE in Toronto

The Canadian Press

TORONTO - Public health inspectors have temporarily shuttered a vendor that sells cronut burgers at the Canadian National Exhibition in Toronto after a dozen people fell ill at the fair.

Toronto Public Health says it has closed Epic Burger, which makes the burger that's part beef patty, part croissant and part donut.

While it's still unclear if the maker of the cronut is the source of the illness, officials say the vendor will remain closed until investigators can figure out just what caused people to report vomiting, diarrhoea and stomach cramps last night.

Paramedics treated 12 people who had symptoms of gastrointestinal illnesses. Five of those people were taken to hospital.

EMS officials haven't been able to say if those treated had eaten food from the same vendors.

CNE organizers say they are "very concerned" about the situation and about the people affected by it.

"An expert team is onsite at the CNE investigating the situation," the CNE said in a statement.

"The CNE has stringent food safety regulations in place which are monitored daily."

Anyone who fell sick after visiting the CNE yesterday is being asked to contact the CNE or the City of Toronto.

The CNE, which runs in Toronto until Sept. 2, features quirky options among its food offerings ever year.

In addition to the cronut burger, this year's highlights also include Nutella fries and a bacon and peanut butter milkshake.