The PSNI said it is treating the criminal damage of dual-language street signs in Co Tyrone as "sectarian hate crimes".
Signs in the Mullaghbane Road and Cullenramer Road areas of Dungannon and the Derrygonigan Road and Mawillan Road areas of Cookstown have been damaged recently.
Signs in the Killymoon Street area of Cookstown were also reported to have previously been defaced with paint.
Police have appealed for witnesses.
Chief Inspector Ryan McConville said: "We are appealing to anyone who may have witnessed suspicious activity in any of the listed areas, or who may have relevant CCTV, dashcam or doorbell footage, to get in touch with police."
"Anyone with information is asked to contact police on 101, quoting reference number 488 of 22/08/25," he added.
"Alternatively, information can also be provided anonymously via Crimestoppers on 0800 555 111."
