This is a general community alert for east and north Donegal – but the public in all areas should be vigilant and should look out for elderly neighbours.
Gardaí in Letterkenny are already investigating two attacks at the homes of pensioners.
Now officers are investigating a third incident at the home of an elderly man in St Johnston.
The first incidents occurred at Drumoghill between 9pm and 9.30pm and at Knockbrack between 11pm to 11.30pm last Monday night.
A vandalism incident at Royal and Prior school in Raphoe in the early hours of Tuesday could be linked to the same gang.
The St Johnston attack took place last Thursday night; once again personal items were taken and once again a knife waved in the victim’s face.
All three pensioners were left badly shaken.
In all the cases men knocked on the door of the houses and forced their way in. The occupants were subdued while the houses were ransacked.
A handbag taken from one of the homes was left discarded in the Lismongahan area of the town between 11.30pm on Monday and 2am on Tuesday.
Gardaí are appealing for anyone with information to contact Letterkenny Garda Station on 074 91 67100.