ACT Policing said a male and female have been sighted on security footage walking through Daramalan College about 1am on Tuesday, smashing a number of windows.

Police were called to the school about 9.45am, when it was discovered that nine windows had been smashed, with an estimated value of $3000.

CCTV footage and forensic evidence has been collected by police for examination.

The male offender is described as about 165 to 175 centimetres and of a medium build. He was wearing a black tracksuit, a dark hooded jumper and a black 'skull' cap.

The female is described as about 165 to 175centimetres and of a medium build. She was wearing light-coloured tracksuit pants, a white top, a multi-coloured scarf and has blonde, shoulder-length hair.

Police said they would continue to focus their efforts on reducing the damage done to schools during the rest of the school holidays.

Anyone with information is asked to contact Crime Stoppers on 1800 333 000 or via the website.