Volunteers at the Dingle Wildlife and Seal Sanctuary were last week shocked to find the bloodied heads of two seals mounted on plywood and nailed to the entrance.
Yesterday, gardaí said they were following a number of lines of inquiry and are hoping security cameras at the centre may provide clues that will lead them to the perpetrators.
The decapitation of the seals has caused outrage among anti-cruelty and animal rights organisations, with some offering financial rewards for information that will lead to convictions.
A volunteer at the centre, Emily Butt said the killings were the work of a few misguided, sick, people. “We’ve had a lot of reaction and are getting a lot of support.”
Seals are protected under the Wildlife Act, and the National Parks and Wildlife Service is also investigating.
There is speculation the killings resulted from anger among fishermen who claim their livelihoods are being threatened by an out-of-control seal population but Francis O’Donnell, of the Irish Fish Producers Organisation, said the killings were the actions of some “disturbed individuals”.