There was never any major danger to the school, the pilot has done a remarkable job of crash landing on a nearby Council-owned sportsground - not the high school oval - as well as missing HT powerlines, after an apparent engine failure.
However, half an hour later, it might have been a totally different story, there would have been schoolkids everywhere.
Plane crashes near high school - The West Australian
Light plane crashes on School Oval| Perth Now
Plane crashes near southern suburbs high school - WA Today