From Catholic News Agency:

The Catholic primate, Archbishop Sean Brady of Armagh, said he intended to seek further details about the event, which drew about 1,000 people.

"True ecumenism is best served by initiatives that are respectful of, and sensitive to, the traditions, ethos and discipline of all those involved," he reportedly said. "Otherwise there is a real danger of causing widespread confusion, raising false hopes and creating situations that are open to misunderstandings and manipulation."

The head of the Church of Ireland also expressed concern about the implications this incident would have on ecumenism.

“Unfortunately, such occasions – while well intentioned – can lead to misunderstandings and misinterpretations at a time when relations between our Churches have improved so much," Archbishop Robin Eames was quoted as saying.