One of the two officials, who spoke on condition of anonymity, said there were questions about what the man's wife told authorities.

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Medics say the injuries of the man attacked on Thursday are not life-threatening and his condition is stable.

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He was found to have known of the dead man's condition, failed to have assessed other detainees or protect them from further mistreatment and not told senior officers what was going on.

BBC: Dr Derek Keilloh

Ultimately, they will find that no condition known to man is more desperate than the loss of freedom.

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That ideas should freely spread from one to another over the globe, for the moral and mutual instruction of man, and improvement of his condition, seems to have been peculiarly and benevolently designed by nature, when she made them, like fire, expansible over all space, without lessening their density in any point, and like the air in which we breathe, move, and have our physical being, incapable of confinement or exclusive appropriation.

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"The man in Canada has a diagnosed medical condition and we need the permission of those treating him to take a DNA sample - to do this we are seeking the assistance of the Canadian authorities, " said Det Supt Langley.

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The man is in a serious condition in hospital days after returning from the Chinese city of Suzhou, officials say.

BBC: Taiwan reports first bird flu case outside China

China's state news agency Xinhua reported Friday that the eastern province of Jiangxi had reported its first case, leaving a 69-year old man in critical condition at a local hospital.

WSJ: Malaysia Bans Chicken Imports From China