Police are investigating further damage to the public toilets at Margaret Street, Ammanford.
The latest graffiti has been caused sometimes between Tuesday, August 6 and Thursday, August 8.
A spokesperson for Dyfed-Powys Police said: "Any persons with information are urged to contact Dyfed-Powys Police on 101 quoting DP-20190809-296.
"Members of the public are urged to report any suspicious behaviour at the toilets to the police."
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