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It’s not only thieves who have been using tunnels to enter premises in London’s Hatton Garden.
When workers in luxury offices near the site of Britain's biggest diamond heist went to retrieve some files from a cupboard they were horrified to find them covered in droppings.
They quickly called pest control company Cleankill Environmental Services who identified the droppings and set about getting rid of the rodents.
During a survey of the premises Cleankill found evidence of up to 30 rats in the cupboard, chewed electric cables and damage to timber in the area.