A pollutant in the River Dodder has caused the deaths of swans from chemical poisoning.
It has become a place of death or menace of death for all these swans.
This report shows swans being carried from the Dodder by the National Society of Prevention of Cruelty to Animals (NSPCA) and being released at the Malahide estuary.
George Burrowes comments
I wouldn't let a dog into these waters in the Dodder.
A Newsbeat report broadcast on 29 July 1965. The reporter is George Burrowes.
Part of this report is without sound.