The pensioner was burgled on Friday in the Camlough Road area of Pomeroy.
The pensioner was at home in County Tyrone when the group entered his house around 7.30pm and restrained the man, who is in his 70s, before making him lie on the floor.
It's said the group then ransacked the house for 30 minutes, taking a number of items with them and leaving the homeowner tied up.
His mobile phone was also taken and so he was unable to call for help. Eventually, he managed to raise the alarm at a neighbour’s house.
Although he sustained only minor physical injuries, the man was left shaken.
Inspector Handley of the PSNI said: "This was a shocking incident and I am appealing to anyone who has any information about it, or saw suspicious activity in the area between 7pm and 8pm yesterday to get in touch with detectives on 101, quoting reference number 1523 of 12/10/18."
