Socialist Lenin Moreno was set to extend a decade of leftist rule in Ecuador yesterday after official results showed him winning the presidential election, as his conservative rival cried foul.

Both candidates claimed victory on the basis of conflicting exit polls from Sunday's runoff, but with 96.94 percent of districts reporting the National Electoral Council said that Moreno - the designated heir to President Rafael Correa's" 21 st-century socialism" - won 51.12 percent of the vote against 48.88 percent for ex-banker Guillermo Lasso.

The election was closely watched as a barometer of the political climate in Latin America, where more than a decade of leftist dominance has been waning.

It may also decide the fate ofWikiLeaks founder Julian Assange, who has been holed up in Ecuador's London embassy since 2012.

Lasso however alleged fraud, claiming that his campaign had evidence of an attempt to rig the results.

“We are going to defend the will of the Ecuadoran people in the face of an attempted fraud that aims to install what would be an illegitimate government," Lasso said, setting up what could be a long and ugly fight.

Some Lasso supporters protested outside election offices in Quito and other cities demanding transparency in the vote count.