Police are appealing for witnesses to an overnight shooting attack on a house at Green Valley, in Sydney’s south-west.Around 11pm yesterday (Sunday 21 December), a series of shots were fired at a home in Hewison Avenue.Five people inside the house heard the volley of gunfire and ventured outside to find a number of spent cartridges and damage to the exterior of the home.The family contacted relatives, who in turn telephoned police.Officers from the Green Valley Local Area Command attended the address and secured the crime scene.Forensic Services Group experts and the Police Rescue Squad also responded.The spent casings were retrieved and will be subjected to a series of ballistics tests.Police are conducting a canvass of the neighbourhood in the hope someone witnessed the attack.

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