An incendiary device was found today at a Co Down shopping centre.
The device appeared to have burned itself out without causing much damage to the Iceland store at the Ards Shopping Centre in Newtownards.
Police urged shop keepers in the town centre to search their premises and report anything suspicious.
Dissident republicans were suspected of planting the device, the second discovered in 36 hours.
Late on Saturday the Next store at the Forestside shopping centre in south east Belfast was extensively water damaged when an incendiary device ignited, damaged stock and set off the sprinkler system.
The latest incident raised fresh fears of a new wave of attacks over the Easter period.
Last December dissidents republicans were responsible for a series of incendiary bomb attacks on shops in the run up to Christmas.