Police were called to the scene of an incident in Newtownards on Thursday evening.
Officers were responding to reports that a crowd of men had gathered at Weavers Grange shortly after 8pm tonight.
North Down and Ards District Commander, Superintendent Johnston McDowell said: "Police evidence gathering resources were already present and additional police resources were immediately tasked to the area.
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"Within 15 minutes, a further crowd of more than 50 people had arrived on foot into Weavers Grange.
"There was no disorder but the crowd had ladders and removed South East Antrim UDA insignia from the gable ends of houses before leaving.
"An investigation is now underway."
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