Bolivian President Evo Morales said on Sunday that he will call for fresh elections after the Organization of American States questioned the results of last month's polls, according to reports.

The Organization of American States' report, issued earlier on Sunday, said the October vote should be annulled after it had found "clear manipulations" of the voting system, which meant it could not verify the result.

Morales, speaking at a press conference in La Paz, also said he will replace the country's electoral body. The department has come under heavy criticism after an unexplained halt to the vote count sparked widespread allegations of fraud and prompted the audit.

In early October, election authorities declared Evo Morales winner of Bolivia's presidential election, but disputed count process triggered riots and a general strike.  

The website of the Supreme Electoral Tribunal (TSE) showed Morales won with 47.06 percent of the votes, followed by the opposition candidate Carlos Mesa with 36.5 percent when 99.8 percent of the votes were counted.

After the election result were released, countries including Brazil, Argentina, and the U.S. expressed concern over how the votes were tallied. 

(With input from Agencies)