A former left-wing guerrilla has taken a commanding lead in several exit polls from Uruguay's presidential election.
But most polls show Senator Jose Mujica has narrowly failed to pass the 50% needed to avoid a run-off vote.
If a second round is officially confirmed, he is likely to face his main conservative rival, the former president, Luis Lacalle.
After polls closed, supporters of his ruling left-wing Broad Front Party celebrated in the capital Montevideo.
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