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In the four-page document, written in shaky English and seen by The Daily Telegraph, Adnan Rasheed described his shock at hearing the 15-year old had been shot last year.
He claimed he had wanted to warn her against criticising the Taliban because of his “brotherly” feelings towards someone from his own Yousafzai tribe.
“When you were attacked it was shocking for me. I wished it would never happened and I had advised you before,” he wrote.
Malala has spent the past nine months in Britain recovering from her injuries.