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Rumors of poisoning circulated at the time, but Palestinian officials denied them, and then-Foreign Minister Nabil Sha'ath said he "totally" ruled them out.
CNN: STORY HIGHLIGHTS
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Mr Walker broke his silence on Thursday with allegations that bosses at the East Midlands Strategic Health Authority (SHA) ignored him when he raised concerns about patient safety in 2009.
BBC: MPs want no action against gagged ex-NHS boss
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But Assif Hussein Sha, the cab driver feels it, too, as he rattles around in his ancient taxi, planning his next book.
NPR: Pakistan Warily Watches Obama Policies