Mexico's ruling party will continue in power but with the narrowest victory in its 59-year history, according to partial results reported by a pro-governmentTV station.

The returns showed ruling Institutional Revolutionary Party (PRI) candidate Carlos Salinas de Gortari, who has already claimed victory, with 48.7 percent of the vote. The next two finishers had a combined total of 46 percent after a hard-fought campaign marred by fraud charges.

The results, broadcast late on Friday night by the Televisa network, were based on nearly 6.8 million voters in 19,100 of the country's 54,100 polling stations. Full official results are not expected until Sunday.