She said she has received information that despite the postal ballot papers being issued to some employees on election duty, the concerned employees have not received them.
Where these ballot papers have gone missing, she asked. "It should be thoroughly investigated".
She said it should also be ensured that there is no tampering with postal ballots in any way.
Pratibha Singh said she is also getting information that some BJP leaders are pressurizing the Returning Officers to vote in favor of BJP by obtaining postal voters' lists from them.