A group representing Catholic police officers in the North says it's advising its members to arm themselves if they go to Mass.
It follows the major data breaches within the force in recent weeks - resulting in the resignation of Simon Byrne as Chief Constable.
Reps from the PSNI are answering British MPs questions today in London.
Superintendent Gerry Murray is Chair of the Catholic Police Guild of Northern Ireland:
"Our members are frightened, scared [and] have no idea what tomorrow will bring for them.
"I have instances where young Catholic officers are asking me, do they carry their personal protection weapon when they go to mass? That has happened.
"And the advice I've given, yes, you do."
