With nearly 95 percent of all votes officially tallied, the current results are "irreversible," said Juan Pablo Pozo Bahamonde, president of the National Electoral Council.
The results end two days of suspense as supporters of opposition candidate Guillermo Lasso took to the streets to protest what they said was an attempt at fraud to favor Moreno, President Rafael Correa's hand-picked successor.
The small Andean country will now hold a second-round of voting on April 2, an election that will remain closely watched in Latin America as Moreno faces off against Lasso, a conservative former banker.
Several losing candidates who shared Lasso's conservative agenda and fatigue with Correa's iron-fisted rule have already thrown their support behind Lasso for the second round, including former congresswoman Cynthia Viteri, who finished third with more than 16 percent. Former Quito Mayor Paco Moncayo, the only leftist among the seven trailing candidates, said he wouldn't ask the 7 percent of voters who backed him to vote for either candidate in the runoff.
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The analysts speculated that the delay in announcing the vote result would help unify opposition support for Lasso.
The slow result announcement was the first time in recent memory that Ecuadorean authorities had not declared a winner on election night. Lasso's supporters gathered in the streets in front of the National Electoral Council overnight Sunday and Monday to demand that a runoff be confirmed.
Rumors swirled on social media as the vote results trickled into a third day today. A group of people broke down a door at a building in Quito where ballots were supposedly being burned. Outside an electoral office in Guayaquil, police erected barricades to keep supporters and opponents of Correa apart.
"Ecuadorean people: You have won. We're going to defend this victory," Lasso told supporters in a video message in which he urged protesters to stay mobilized. He said he had called several regional presidents and the head of the Organization of American States to express his concern.
Electoral authorities appealed for calm, saying it could take until today to know if a runoff would be necessary.