Speaking outside the Old Bailey, Jenny Hopkins, of the Crown Prosecution Service, said Thompson put scores of lives in danger by starting the Croydon blaze, including both firefighters and those living nearby.
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After decades of struggling negotiations both activists and delegates are hoping for some form of landmark agreement.
World Rugby chairman Bernard Lapasset led the tributes, calling Lomu 'a giant' of the game.
Jaw bone fragment studied by British scientist comes from a smaller cousin of the better known Triceratops.