Leftist political novice is sworn in as country's fifth president in three years as it celebrates 200th anniversary of independence.
Conservative former banker Guillermo Lasso declared himself Ecuador's president-elect as socialist opponent Andres Arauz conceded defeat in Sunday's election with 98 percent of the votes counted.
Whoever wins will take over from President Lenin Moreno on May 24 and will immediately face an economic crisis exacerbated by a 7.8 percent contraction in GDP in 2020.
Many Ecuadoreans are weary of painful economic austerity measures and eager for a return to socialism, encouraging left-wing candidate Andres Arauz who hopes to win without needing a runoff vote.
Interim results of Sunday's referendum show 64 percent of ballots in favour of restoring the measure which prevents presidents from running indefinitely, effectively barring ex-president Rafael Correa from making a comeback.
The country's National Electoral Council says there was no indication of fraud in Sunday's elections but Moreno's conservative opponent Guillermo Lasso insists the vote was marred by fraud.
Leftist government candidate Lenin Moreno declares victory, but conservative challenger Guillermo Lasso is demanding a recount and alleging voter fraud.
With voters in Ecuador torn between continuity and change, the presidential election remains too close to call.
Leftist candidate Lenin Morena had a clear lead on Sunday's election over his adversary ex-banker Guillermo Lasso, but was just shy of the 40 percent of the vote needed for an outright victory.
The electoral council says the final result won't be possible until Wednesday as votes continue trickling in from isolated areas and from Ecuadorians abroad.
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