Two students from Northam Senior High School have been arrested over discharging two “chemical devices” that resulted in another student being taken to hospital.
Around 9.15am police received reports of the incident and attended the school, alongside firefighters and crew from St John Ambulance.
Two teenage boys were arrested, while a third student was taken to Northam Hospital as a precautionary measure.
Anyone with any information in relation to the incident is asked to make a report to Crime Stoppers.
There is no ongoing risk to the public.
The school sent out a text message to parents assuring them all students were safe.
“There was an incident at the school today that required a partial evacuation of the quad area for precautionary reasons,” it read.
“The school day returned to normal at 11.30am. We thank our community for their support and appreciate the inconvenience and worry these issues cause.”
One person posted to a local Facebook group saying their children had been told they were not allowed to leave their classrooms this morning as the incident unfolded.
Another person, believed to be a student at the school, said students who felt sick or saw what happened were checked on in the office, while others who were around during the incident were taken onto the oval.