Published Thursday, 11 February 2010
Father Sean Cahill is the parish priest at St Malachy's Church in Castlewellan.
The alleged victim claimed he was abused by five priests while he was being cared for at the Nazareth House orphanage on the Ormeau Road in the 1970s.
Father Cahill has denied the allegation.
A spokesman for the diocese said: "We are aware of an allegation against a priest relating to the early 1970s.
"The diocese is co-operating fully with police and social services".