Investigations are under way into the unlawful killing of two peregrine falcons in Co Louth.
The birds of prey had recently established a nest in a remote location in the Cooley Mountains.
Three eggs and two dead adult falcons were recovered by National Parks and Wildlife Service staff from the nest site.
The adults were unlawfully killed while trying to incubate their young.
Forensic and other evidence is being gathered in the hope that a successful prosecution can take place.
The peregrine falcon is the fastest bird in the world.
Its numbers were decimated during the 1950s and 60s due to the widespread use of agricultural pesticides.
Since then, the peregrine has experienced a population recovery.
However they remain vulnerable to human persecution, which is the prime threat to the stability of the population.
The NPWS said this has been clearly highlighted through these incidents in Co Louth, as well as other shootings and poisonings which have claimed peregrines in recent years.
During the period from 2011 to 2015 records on bird of prey persecution in Ireland indicate there were 109 incidents recorded, including eight peregrine falcons who were shot and 16 others poisoned.
The NPWS and gardaí are investigating the incident in Co Louth.
They are appealing to anyone with information to contact Dundalk Garda Station on 042-9388400 or the local conservation ranger on 076-1002637.
