Former Pakistani leader Benazir Bhutto, the first woman prime minister of an Islamic nation, was assassinated in an attack at an election rally in the city of Rawalpindi. She was 54. ``She's dead,'' a Bhutto aide, Imran Hayat, said today as he sobbed in a telephone interview from Rawalpindi General Hospital. Rioting began as her supporters gathered outside the hospital. It wasn't immediately clear whether Bhutto died in the blast or was shot by the bomber before he blew himself up, Bhutto spokesman Farhatullah Babar told state-run television. Interior Ministry spokesman Javed Cheema said earlier in a phone interview that she was killed in the bombing. At least 15 other people were also killed and more than 60 were injured, police said. President Pervez Musharraf condemned the killing and appealed for calm in a statement broadcast on state television, after rioting broke out in cities across Pakistan. In Rawalpindi, where the army has its headquarters, shops were torc...