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Police have released a photograph of the sledge hammer used during a robbery at Ilkeston on Monday evening.
A gang of men smashed the front doors of the town centre's Nationwide Building Society in Bath Street at 8.50pm and threatened security guards.
The men had hammers and grabbed four cash boxes, leaving with a significant amount of cash.
No-one was hurt and reports suggest the robbers had their faces covered, they left in a car.