The Police Service of Northern Ireland (PSNI) has warned shopkeepers and shoppers of possible incendiary bomb attacks over Christmas.
The PSNI fears dissident republicans could strike during the last-minute rush.
Owners have been urged to check premises before closing tonight and police patrols were to be stepped up.
In a statement assistant chief constables Duncan McCausland and Peter Sheridan warned: "An extra few minutes could make a difference."
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