Baitullah Mehsud is a pro-Taliban leader in South Waziristan, the rugged tribal region in northwest Pakistan. The Pakistani government has accused him of involvement in the Dec. 27 assassination of opposition leader Benazir Bhutto, along with a series of suicide attacks on the country's security forces. What evidence does the government have linking him to the attacks? And how much influence does he have among the pro-Taliban forces?

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