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.
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.