Lahore (CNN) -- Nawaz Sharif, the prime minister whose government was overthrown by a military coup more than a decade ago, appears to be back on top in Pakistan, election officials said Sunday. According to unofficial results in Pakistan's violence-marred election, Sharif's party looks to have won most of the seats in the National Assembly. It won 16 of the 23 seats in the lower house, election officials said. Imran Khan, candidate for the Tehreek-e-Insaf (Movement for Justice) party, said the elections were rigged. "Police (were) used, and how the -- the staff of the Election Commission were used," he said. "And unfortunately it's because the provincial governments were in power right up till 20 days before the elections -- so they had plenty of time to place their people."
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NEW: U.S. looks forward to working with new government, secretary of state says
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Former prime minister's party appears to have won most seats in National Assembly
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Other candidates allege there were instances of voting improprieties
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Attacks on polling stations cause death and injury in Karachi, Peshawar and Balochistan
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