Two schools on Coolah Street have been damaged, defaced and ransacked in two separate incidents this week.
One school was broken into at around 10.30pm on Tuesday night.
Police were came to the school after speaking to the security after an alarm was activated.
Gauze on the windows was cut to gain access into the rooms.
The rooms were then gone through and ransacked heavily, however it is alleged nothing was stolen.
Security report hearing people however were unable to catch a glimpse of the intruders.
In another incident, school security responded to an activated alarm at another Coolah Street school at 2:30am on Saturday morning.
Drawers and filing cabinets in the administration office were searched, with contents strewn across the floor.
A number of tables were defaced with graffiti.
If you see any suspicious behavior, contact Griffith Police Station on 02 6969 4299 or call Crime Stoppers on 1800 333 000.