Hazmat crews were called after three people got sick inside a grocery store in Ewing Township, Mercer County, N.J.
The ShopRite in Ewing Center on North Olden Avenue was evacuated for a couple of hours during the early afternoon after the victims reported feeling ill. They were treated at the scene.
Hazardous materials teams checked out the store but couldn't identify anything as the cause.
Police said repair work was done on the heating system earlier in the day, but they don't know if that had anything to do with the incident.