The ruling party's Lenin Moreno has been declared the victor of Sunday's presidential election over Guillermo Lasso by Ecuador's National Election Council.
"Ecuador has chosen freely", he said in a televised speech.
Ecuador's President Rafael Correa, center, Vice-president Jorge Glas, left, and presidential candidate Lenin Moreno of ruling party Alianza Pais, wave to supporters from the government palace balcony in Quito, Ecuador, Monday, April 3, 2017.
Moreno pocketed 51.16 percent of valid votes versus 48.84 percent for conservative challenger Guillermo Lasso, with 99.65 percent of votes counted, according to the council.
Supporters of Ecuadorean opposition leader Guillermo Lasso gathered in the streets for a second night Monday to protest what they consider fraud at the ballot box that tilted a presidential runoff in favour of his leftist rival.
The scene was much calmer than the one on election night, when thousands of outraged Lasso supporters shouting "fraud" crashed through metal barricades to nearly reach the entrance of the electoral council's headquarters in Quito.
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A previous state provision required the ultrasound but didn't specify when it had to occur. Attorneys for the state of IN have not yet said if they will appeal the ruling.
The National Electoral Council (CNE) President, Juan Pablo Pozo, urged either of the two political parties to submit their claims by using the corresponding institutional channels.
"If in the recount of votes they win by a vote, here I am to recognize that victory", Lasso said, while alleging that the counting of votes involved "fraud" that he described as "brazen".
The Organization of American States, which acted as an observer during the election, said it had seen "no discrepancies" between polling station and official results.
Likewise, the candidate of Creando Oportunidades (CREO) assured that if in the results of the recount, his official opponent Lenin Moreno is a victor, he will recognize the triumph.
The second round of Ecuador's presidential elections was held on Sunday. Moreno said he would let him stay.
Many voters had said they favoured change amid ongoing corruption allegations related to bribes that Brazilian construction giant Odebrecht paid to officials in Correa's government and a $12 million contracting scandal at state-run PetroEcuador.