Seven students from St. Mary's Catholic School in Pontiac were treated at a local hospital and released Tuesday, but officials still are unsure what caused the students to feel ill. At 11:15 a.m., the Pontiac Fire Department was called to the school at 414 N. Main St. after several students reported feeling unwell. Seven were then transported to OSF Saint James-John W. Albrecht Medical Center in Pontiac. "They were treated and released and are all OK," said Pam Meiner, a spokeswoman for the hospital. Officials at the school declined to comment to The Pantagraph. There is no announcement on the school's web or Facebook pages about classes on Wednesday. Additional resources were called to the scene, including emergency medical services from Dwight and the Pontiac hospital, Odell and Saunemin fire protection districts, Nicor Gas, the Pontiac Wastewater and Treatment Plant, Popejoy Plumbing-Heating-Electric Co. and Southeast Livingston County Ambulance Service. The Fairbury Fire Department also was requested and handled other emergencies in Pontiac during the incident. Capt. Jacob Campbell of the Pontiac Fire Department said the fire department, wastewater and treatment plant, and gas company all performed testing at the school but did not receive any hazardous readings on their monitors. "The school has contacted additional inspectors to further investigate their facility," he said. The incident remains under investigation.