Guardian: Amid the confusion of breaking news reports following Ahmed Wali Karzai's assassination, I mentioned the name of the alleged assassin, Sardar Mohammed, to someone close to the murdered man. The reaction was a gasp of disbelief. Mohammed, who commanded a force of men who ran checkpoints close to Ahmed Wali's hometown of Karz, had worked for the Karzai family for years and was from the same Popolzai tribe and district. The fact that he was allowed to bring his weapon into Ahmed Wali's presence shows just how trusted he was. It seems likely that there was a personal motivation behind the attack, despite the Taliban claim of responsibility. Kandahar is a hotbed of long-running personal vendettas.