The search has revealed the remains of more than 30 people, including men, women and children.
Most of these appear to be regular burials from when the cemetery was still operational.
But a handful of the remains contained items and personal effects that suggest a religious connection.
These include bits of clothing and medallions worn by the nuns of Saint Catherine.
IPN said: “Objects of a religious nature found near a few of the people suggest the graves of nuns and priest have been discovered.
“Among the found people, remains were selected that were assumed to be the three wanted sisters – martyrs from 1945.
source: express.co.uk