Around 1.15pm today, police were called to Lanyon High School after reports of a 15-year-old student making threats against others.
The school followed procedure and the student was contained within a classroom while other students were relocated from that area into a nearby hall.
The student then ran from the classroom and dropped his school bag within the grounds. The bag appeared to contain a device of some sort.
The student then fled on foot into some storm water drains nearby. He was pursued on foot by police and a teacher and was finally apprehended some distance from the school.
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He was taken into custody in Flegg Crescent, Gordon and conveyed to Tuggeranong Police Station where enquiries are ongoing.
The SRS Bomb Response Team attended the high school to examine the suspicious device within the bag. This is ongoing and will result in traffic issues within the area due to police cordons.