Gardaí are investigating three separate aggravated burglaries at a social housing estate for older people in Dublin.
At around 9pm last Friday night, a man forced his way into a house on Ballygall Road East in Glasnevin where he threatened and assaulted a man in his 60s at knifepoint before making off with a sum of cash.
Shortly after midnight on Tuesday, the occupants of two houses in the same estate, a man in his 80s and another man in his 60s, were threatened at knifepoint by two men, before being tied up.
The intruders escaped with sums of cash.
Gardaí are carrying out forensic examinations to see if the incidents are connected.
No arrests have been made.
Fianna Fáil General Election Candidate in Dublin North West, Cllr Paul McAuliffe said the "heinous" behaviour would not be tolerated.
“These are very serious, terrifying incidents of crime and what is even more concerning is that elderly people in our living community appear to have been repeatedly targeted.
“In order to reassure older people that they will be safe in their own homes, Fianna Fáil has long proposed to implement mandatory minimum sentences for those convicted of assaults on someone elderly.
“We must send a strong message that this type of heinous behaviour will not be tolerated in our area,” he said.