Iran's Guardian Council has been given five more days to study the disputed presidential elections, the ISNA news agency reported on Wednesday.
Following the outbreak of violence after the June 12 vote in which Mahmoud Ahmadinejad was declared the winner of a second presidential term, the Guardian Council had been granted 10 days to rule on claims of election fraud.
Iran's state TV on Tuesday reported that the country's top electoral authority had ruled out annulling the election results, even though it had admitted that irregularities were found.
A spokesman for the Guardian Council, Abbas Ali Kadkhodaei, was quoted by Iran's state-run English language Press TV on Tuesday as saying that the organization had found "no major fraud or breach in the election."
AP contributed to this report