Published Saturday, 05 October 2013
The incident happened on Friday afternoon. (© UTV)
The man caught one man and helped find another a short time after an elderly woman's house was targeted in the Blaney Road area of Newtownhamilton.
The victim, in her 80s, was left "deeply shocked" but not physically injured while the two men, aged 15 and 28, were taken into police custody.
South Armagh Neighbourhood Inspector, Lorraine Dobson, said: "I would like to convey my thanks to the member of the public who assisted my officers.
"His quick thinking and brave actions and the timely response from local officers has resulted in the apprehension of two suspects."
The robbery happened at around 4.30pm on Friday.
Police are asking anyone who was in the area at the time and who may have witnessed this incident or noticed any suspicious activity to contact them on 0845 600 8000.
© UTV News