"Police also located a pistol and ammunition during the search, along with a quantity of cannabis."
She said this was a frightening incident for the staff who were involved.
"Fortunately none of our staff where physically harmed in this incident but the lasting impact for these officers cannot be underestimated and we are ensuring they are provided with ongoing support," Rogers said.
"I want to acknowledge the staff who have been investigating this matter for their dedicated efforts to locate this dangerous offender who is allegedly responsible, and hold him to account."