Acting Superintendent Gary Lewis said schools were a �soft target� for criminals who could break-in without the concerns that come with home burglaries where there is risk that residents could catch them.
Supt Lewis said while it was not a �dramatic rise� in burglaries, residents needed to be wary.
�Anyone who spots anyone suspicious on school grounds, please report to police,� he said.
�People are not meant to be hanging around school buildings after hours.�
He said police had responded to recent cases in Joondalup, Clarkson and Warwick.