Burglars broke into the gym and a classroom at Hillcrest High School overnight.
Senior Sergeant Pete Simpson said police were called to the school about midnight.
He said at least three offenders had been chased by security staff but were not caught.
"They dropped the gear they had and took off," Mr Simpson said. "Unfortunately nobody was able to get close enough for a description.”
He said a team of police would be at the school today looking for finger prints and any other clues that might identify the burglars.
Anyone with information about the burglary are asked to contact Hamilton Police on 07 858 6200.
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