Daniel Rigby was given a life sentence and ordered to serve a minimum term of 17 years before he would be considered for parole.
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Coal producers in America's 'energy capital' are trying to change the face of the fossil fuel industry amid concerns over fossil fuels.
Temperatures slide to -15C in places
A fire, which police believe was arson, killed a 14-year-old girl, an eight-year-old boy and a seven-year-old girl.