Three IKEA stores in the Netherlands, France and Belgium have been hit by firework attacks. No injuries have been reported and the Swedish furniture stores have reopened.
Outlets in Eindhoven in the Netherlands, Ghent in Belgium and Lille in France were all targeted.
Some reports suggest that the explosives were placed inside alarm clocks and two were triggered by remote control.
All three locations were hit by similar devices.
In Eindhoven the explosion destroyed a dustbin outside the store shortly before it closed on Monday evening.
IKEA say the company has received no threats in connection with the incidents.
Dutch IKEA stores have a history of receiving bomb threats, some serious some bogus.