A PSNI officer and his family have been forced to leave their home in Maguiresbridge in Co Fermanagh after the discovery of a device.
The suspected grenade was found outside the policeman's home in Drumeer Road at about 8pm yesterday.
Police said the road remains closed and a security operation in the area is continuing.
Dissident republicans are being blamed for the incident.
SDLP Fermanagh and South Tyrone MLA Tommy Gallagher said the Maguiresbridge incident was cowardly.
'While it is yet unclear who is responsible, their actions will be wholeheartedly condemned by everyone in our community,' he said.
'Their cowardly actions - attacking a family in their own home during the Christmas period - are in stark contrast to the bravery of those who continue to serve our community in the Police Service of Northern Ireland.
'I would appeal for anyone with information as to who was responsible to bring it to the PSNI without delay.'
