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Two young children were threatened in what police described as a targeted robbery in Dolphins Road, Folkestone.
Up to six people forced their way into a house just before 10pm on Monday.
It is believed that they threatened two young children in the house. Cash and jewellery were also stolen.
Det Insp Steve Bridges said: "We don't think this is a random attack, and believe that the family was targeted."
Anyone with information should contact police on 01303 289180 or Kent Crimestoppers on 0800 555111.