Police have arrested a 17-year-old in connection with the murder of Thavisha Lakindu Peiris, who was stabbed to death in Sheffield on Sunday during his last shift as a delivery man for Domino's Pizza.
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Nigel Farage warned on Friday Britain was "far less safe" and exposed to Cologne-style sex attacks because of open-door immigration.
Arthur Simpson-Kent, 48, admitted killing Ms Blake and their sons according to his lawyer.
Two brothers have been arrested on suspicion of murder after their parents were found dead in their own home over the weekend.