A significant presence from the Northern Ireland Fire and Rescue Service (NIFRS) were in attendance at a property in The Green area of Holywood. Police were also at the scene.
In a statement, PSNI said: "Police in Newtownards received a report of a house fire in The Green area of Holywood at approximately 12:15pm this afternoon.
"Police attended the scene along with other emergency services."
Images from social media show at least three NIFRS appliances in the are, as well as police vehicles.
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The NIFRS has been contacted for comment.
There are no further details at this time.