Mexico | Election results

"The campaign exposed Mexico's deep class divisions, with Lopez Obrador of the Democratic Revolution Party pledging to govern for the poor and Calderon of the ruling National Action Party seen by many as the candidate of the rich."

MEXICO CITY - Two bitter rivals declared themselves winners of Mexico's extraordinarily close presidential race even though election officials said official results wouldn't be ready for days - sparking cries of fraud from supporters and fears of violence.

The candidates - a conservative bureaucrat and a leftist - were separated by fewer than 300,000 votes with more than 30 million counted in a preliminary tally by electoral officials. The conservative, Felipe Calderon, had 36.9 percent to Andres Manuel Lopez Obrador's 35.7 percent, according to results from 87 percent of polling places.

But the Federal Electoral Institute stressed those results weren't final - and said it wouldn't declare a victor until an official count due to start Wednesday.