Police were called out to a prominent private boys school on Friday afternoon after reports of up to 150 students causing chaos around the college.
Parents and neighbours of The Scots College in Bellevue Hill in Sydney's eastern suburbs, were left terrified when Year 12 students went on a day-long rampage.
Officers said they seized alcohol and issued a move on direction to the group, who reportedly threw glass bottles at younger students, overturned a grandstand on the main oval and hijacked a golf cart, News Corp reports.
According to students, several buildings were also pelted with eggs and watermelons.
"It was horrible. The teachers were scared and some of the students were knocking on doors of the staff-room to get away from it all," one witness said.
One neighbour of the $34,900-per-year school saw cars being trampled on and students spray painting.
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"Kids were running down the road screaming and swearing. It was disgusting. Teachers were powerless," the neighbour said.
Police said they were called in response "to anti-social behaviour by a large group of youths".
"The move on direction was complied with without incident and police didn't make any arrests or press any charges," a police spokesperson confirmed to 7 News Online.
A 12-year education at the school costs about $575,000, making it one of the most expensive schools in the state.
The school was in hot water just last month after HSC trial papers were stolen during an overnight break-in.