A woman died at the scene and two children, aged four and six, died later in hospital, police say.
The injured woman and two children were found by police at a property in Petherton Court, Kettering
Officers were called to flats in Petherton Court, Kettering, at 11:15 GMT where a boy and a girl, believed to be aged six and four, were found. Supt Steve Freeman said: "It is a desperately sad incident and I want to be absolutely clear on our unwavering commitment in establishing what has happened here and in seeking justice for this woman and these young children.
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