Dublin gardaí are investigating an aggravated burglary at a house in Terenure.
It happened at Lavarna Grove on March 8th at around 1.45pm.
Gardaí say two men called to a house under the pretence of checking the water pressure.
A woman in the house, aged in her late 80s, allowed them in.
She was then threatened with a knife.
The two men left with a small sum of cash.
However the woman was uninjured in the incident.