The Taliban claimed responsibility for the killings. A spokesman said they were killed because they were 'spying for the Americans' and 'preaching Christianity'.
However, in a statement, Dr Woo's family said: "Her motivation was purely humanitarian. She was a Humanist and had no religious or political agenda. She undertook this trek as a medical doctor, accompanying medical supplies and to provide treatment to people who lived in an extremely remote region who had little to no healthcare available. Her commitment was to make whatever difference she could. She was a true hero. Whilst scared, she never let that prevent her from doing things she had to do."
The statement continued: "Karen, you were an inspiration to everyone you met. You combined brains and beauty, intelligence, drive and kookiness in equal measure. You led an intensely packed and rich life: dancer, model, stunt plane walker, doctor and aid worker. Whatever you set your mind on, you did so with passion. You were the embodiment of seizing the moment. You went through life always believing the best of everyone despite everything you've seen.
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