"Shortly after 11pm, Police received a number of calls relating to multiple shots being heard in Māngere," he said in a statement.
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"Police have identified a number of used bullet casings on the footpath outside a property on Plumley Crescent."
The scene was examined and it appeared there was no damage to property or vehicles.
"At this stage, initial indications suggest a firearm may have been discharged into the air."
Police would be investigating further today. Anyone with information - or who saw suspicious activity around Plumley Crescent last night - should call Counties Manukau Police on 105, quoting file number 210909/8189.
You can also contact Crimestoppers anonymously on 0800 555 111.