FORMER Pakistani prime ministers and bitter rivals Nawaz Sharif and Imran Khan both declared victory in elections marred by delayed results and militant attacks, throwing the country into further political turmoil. Sharif's party won the most seats by a single party in Thursday's election, but supporters of imprisoned Khan, who ran as independents instead of as a single bloc after his party was barred from the polls, won the most seats overall. Sharif said his party would talk to other groups to form a coalition government as it had failed to win a clear majority on its own. Sharif's announcement…