Police have launched an investigation into the "mindless" damage to an iconic Welsh memorial near Aberystwyth.
The Cofiwch Dryweryn memorial on the A487 near Llanrhystud was vandalised twice in one week.
Dyfed-Powys Police recorded the incident as a hate crime as well as criminal damage.
A police spokeswoman said CCTV has been set up at the scene.
Volunteers rebuilt the wall on Saturday after vandals smashed part of it a day after it was defaced with graffiti.
The roadside memorial has stood since the 1960s and refers to the flooding of Capel Celyn village, near Bala, to provide water for Liverpool in 1965.
Dyfed-Powys Powys say they are aware that the memorial has been repeatedly damaged with graffiti over the last few months and has caused "significant distress to communities both locally and nationally".
Inspector Chris Fraser said: “I understand the strength of feeling about the Cofiwch Dryweryn memorial, and that repeated damage to it has caused significant upset in the community.
“I want to give reassurance that we are taking this matter seriously, and will carry out a full investigation in to this mindless damage."
Witnesses are asked to come forward and speak to the police by calling 101 quoting 55 of April 13.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here