Bolivia's President Evo Morales has called for fresh elections after an audit warned of irregularities in last month's vote.
Mr Morales was named the winner after a general election on 20th October, securing a fourth term in office.
With 47.08%, he was just over ten points ahead of second placed Carlos Mesa - a margin that meant a second round run-off vote would be avoided.
However, recent weeks have seen the results disputed amid widespread allegations of electoral fraud - prompting major anti-government protests on the streets of Bolivian cities.
The Organisation of American States (OAS) - the international body which monitors elections in the region - has now released their preliminary report following an audit of the vote.
It claims there were "clear manipulations" of the voting system.
Saying they could not verify the result of the vote, the group said the first round of the elections held last month "must be annulled" and the electoral process should begin again.
It also calls for the country's electoral board to be replaced.
Today, Mr Morales confirmed he was urging authorities to call new national elections.
He said it was essential that people could "freely, democratically and peacefully" choose their leaders - and confirmed the members of the electoral board would be replaced.
The president urged Bolivians to 'reduce the tension' in the country and to end any violence.
Mr Morales - who was first elected in 2006 and has served three full terms - has denied any wrongdoing and refused to resign over the electoral crisis.
The ongoing protests in Bolivia have seen at least three people die during clashes.
BBC reports that Friday saw police officers joining protesters in several cities.