Fire and Emergency NZ says crews encountered an "unknown chemical" upon arrival at a school in Ashburton this morning.
Emergency services were called to St Joseph's School just before 10am on Friday.
FENZ said it sent two crews from Ashburton and a HAZMAT crew from Timaru.
"Crews encountered an unknown chemical on arrival and are working with ambulance to make the scene safe," a FENZ spokesperson said.
St John said it had sent an operations manager and ambulances to the school.
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Two patients in a minor condition were taken to Ashburton Hospital.
The school has been approached for comment.
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