The parents of Chloe Waddell reportedly tried to revive her after finding the swimmer unconscious at their home in Timperley.
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It is produced by using steam distillation to extract active substances from cannabis plants and is typically consumed orally.
Another three men were injured in the attack in the city of Malmo.
William Hague said that the war on the drug had been ‘comprehensively and irreversibly lost’.