(COLORADO SPRINGS) — The Colorado Springs Fire Department (CSFD) is investigating North Middle School following reports of students ‘mildly not feeling well’ on Thursday, Dec. 15.

The CSFD Hazmat team is on scene at North Middle School located at 612 East Yampa Street after receiving reports of 11 middle school students feeling unwell.

According to Colorado Springs School District 11 (CSSD11), North Middle School is on a “precautionary HOLD status” due to a strange smell in parts of the school. Students are being held in the cafeteria, says CSSD11.

At this time, CSFD says the team is not finding any obvious source of danger or substance.

This story will continue to be updated.