Schools are being told they need to keep the lines of communication open when lockdown procedures are in place.
A KPMG report into how Canterbury schools handled the lockdown found some schools thought it was a hoax.
It also says some staff members had to deal with aggressive and concerned parents.
The report highlighted major issues on the day - including not having access to toilets, food, water and medication for up to four hours.
Burnside School Principal and member of the steering group for the lock down report, Phil Holstein told Chris Lynch he wasn't surprised by the findings from the report.
"I’m constantly impressed by the quality resilience and support our students have for each other”
"Our staff and senior leaders did a fantastic job in the challenging and unprecedented circumstances. Our students were safe, and the care along with the professionalism from the staff was top level."
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