CANBERRA Grammar and Canberra Girls Grammar was significantly damaged after two offenders smashed more than 100 school windows, bus windows and the Rowing Centre on Monday (July 9).
The damage was caused between 1am and 2am.
One offender was wearing black Adidas branded tracksuit pants, a black, long-sleeved Nike SB top, and had his face was covered by a dark piece of cloth with a lighter pattern.
He was wearing a black New York Yankees baseball cap and black Nike shoes.
The second offender was wearing a long-sleeved black top, black tracksuit pants, black shoes, and had their head covered by a lighter-coloured length of material as a makeshift hood.
Both offenders used a baseball bat in the incident.
Police would like to speak with the driver of a vehicle that drove past the Rowing Centre while the incident was taking place. The driver is not believed to be involved in this incident, but they may have seen it, or have other information that could help police.
Police also urge anyone with information that could assist in this investigation to contact Crime Stoppers on 1800 333000 or report via the Crime Stoppers ACT website.