Shop owners in Northern Ireland have been urged to thoroughly check their premises after an incendiary device was found in a supermarket.
Army technical officers defused the device left in Sainsbury's at the Sprucefield complex near Lisburn.
Dissident republicans have been linked to fire bombings which destroyed several stores across the province.
Devices have been discovered in Lisburn, Newry, Antrim, Londonderry, Newtownabbey and Ballymena.
Assistant Chief Constable Duncan McCausland said on Wednesday that it was lucky that no-one had been injured in the attacks.
"We have seen a number of incidents over the past month where stores have been fully or partially destroyed by incendiary devices," he said.
"These have tended to ignite overnight when the shops have been closed."