UPDATE: 11.20am Police are at this stage unable to confirm the nature of the operation in Maiden Gully.
A police helicopter was seen circling around an area of bushland at 9.30am on Friday and a number of police were seen guarding a house near Rathbones Lane.
Police have since left the scene.
A number of non-uniformed police were located in different streets surrounding an area of bushland in Maiden Gully.
EARLIER A police helicopter is circling above Maiden Gully.
The air wing is part of an operation underway in the area.
Police have surrounded an area of bushland.
More to come