An end-of-school-year prank at a top Christchurch secondary school could have had "tragic consequences", the headmaster says.
A group of year 13 students at Christchurch Boys' High School (CBHS) chased and hurled water balloons and eggs at two year 11 students just before 1pm yesterday.
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The stunt resulted in one of the boys being chased onto a road outside the school, where a vehicle ran over his foot.
Another student was assaulted, CBHS headmaster Nic Hill said.