We lived in the second-floor flat of a small two-and-a-half-family house on a tree-lined street of frame wooden houses with redbrick stoops, each stoop topped with a gable roof and fronted by a tiny yard boxed in with a low-cut hedge.

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"Even on a flat landscape - once you get say five kilometres away, you will find even a hedge or tree will obscure the view, " Mr Vince said.

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The 44-year-old, who shared the Biddeford flat with the two victims and her six-year-old son, said she had hidden behind a Christmas tree.

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