SYDNEY - A British woman was stabbed to death on Wednesday at a backpackers' hostel in Australia and two people were injured, one seriously, in what police say may have been an 'extremist' attack. A spokesman for Queensland state police said the suspected attacker, in Australia on a tourist visa, was a 29-year-old French national who had yelled 'Allahu Akbar' (God is great in Arabic) when arrested. A 21-year-old British woman died at the scene of the attack, south of Townsville, police said. A 30-year-old British man was taken to hospital and was in critical condition.