ISLAMABAD—Former Pakistani President Pervez Musharraf will be charged next week with the alleged murder of ex-Prime Minister Benazir Bhutto, his lawyer said, the latest turn in a political drama that has unfolded since his return from exile in March.

News of the pending criminal charge came as details emerged on Tuesday about an audacious overnight Taliban jailbreak of some 250 prisoners including what a Pakistani official said were 40 to 50 "hard-core terrorists."

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