Police have launched a double homicide investigation after two people were killed and two others seriously injured in Phillipstown.

Police were called to an address on Olliviers Road about 12.50am on Saturday.

Detective Inspector Nicola Reeves said two people died at the scene, while two others were taken to hospital with serious injuries.

Two other people are in police custody and are assisting with enquiries.

Reeves said police believe the incident was isolated and are not seeking anyone else in connection with the deaths at this stage.

Police have reassured residents there is no ongoing risk to public safety, while acknowledging the incident would be deeply upsetting for people living nearby.

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An increased police presence is expected in the area over the coming days as scene examinations continue.

Police are appealing for anyone who witnessed the incident or has CCTV footage from the area to come forward.

Anyone with information can contact police on 105, quoting file number 261010/6589.

Information can also be provided anonymously through Crime Stoppers on 0800 555 111.