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The group campaigning for a No vote in the Marriage Equality referendum says it has put together a dossier providing "incontrovertible evidence" of Yes campaigners vandalising No campaign posters all over the country.
The file includes video and photographs of posters being taken down, already pulled down and defaced.
Mothers and Fathers Matter this morning held an event in Dublin to draw attention it.
The group said: "We will be giving this dossier to the Chief Superintendent of every Garda divisional area where an incident has come to our notice to draw their attention to what is happening.
"We are also aware that individual members of the public are going into Garda stations in their local areas to report the illegal attacks on No campaign posters."
The Yes Equality campaign earlier said the removal of any poster in the run-up to the Marriage Equality Referendum is not something they want to see.
“It is an offence to take down any poster. We unreservedly condemn any such act,” said Brian Sheehan, Yes Equality spokesperson.
“Members of the public who witness the removal of posters should report it to their local Garda station.”