Osama Bin Laden's last years at his final hideout were haunted by his accurate hunch that he was hunted by a remorseless and tech**logically advanced foe. According to a letter that was declassified on Wednesday and provided by the CIA to AFP -- which can**t independently confirm its authenticity -- Bin Laden warned one of his wives travelling from Iran to rejoin him to take special care. "Before Um Hamza arrives here, it is necessary for her to leave everything behind, including clothes, books, everything that she had in Iran... Everything that a needle might possibly penetrate," Bin Laden wrote, in a letter dated September 26, 2010.