The decision was wade on Sunday on the status of ballots cast at 5,000 polling stations from across the country.
IEC said the election commissioners also validated ballots from 1,837 polling stations, while ballots from 2,165 polling stations were partially invalidated.
A statement released by IEC said the ballots which were invalidated on Sunday, included ballots from 191 standard audit cases and 45 others were from special scrutiny cases.
The statement further added that ballots which were partially invalidated, included ballots from 915 standard audit cases and 1,250 from special scrutiny cases.
“Commissioners also confirmed the need for closer investigation of 762 polling stations (of which 514 were standard audit cases and 248 were cases of special scrutiny),” IEC said.
IEC said the commissioners make their decisions after having reviewed audit findings, as recorded on checklist forms.
“Audit checklist forms, completed by Audit Teams during the audit process, indicate whether the contents of ballot boxes are valid, invalid or partially invalid, according to IEC Decision 33‐1393,” the statement, said adding that “When they feel it is necessary, Commissioners are also examined individual audit checklist forms (electronic copy or original) for further clarification; or request advice from the United Nations.”