Forensic teams have been seen combing the area as police appeal for anyone with information to come forward.
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Detective Chief Inspector Fiona Gaffney said: "“Although our enquiries are still at a relatively early stage, we believe this has been a targeted attack on the property."
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Detective Chief Inspector Fiona Gaffney added: "We have specialist detectives carrying out extensive enquiries to establish the full circumstances of this incident to identify those responsible."
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Anyone with information is asked to contact the Firearms Investigation and Prevent Team via 101 quoting reference 13200555059 or online.
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Information can also be given anonymously to the independent charity Crimestoppers on 0800 555 111.
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