Final election results were being delayed by pending investigations into nearly 300 complaints, which also concern prospective winners in 66 constituencies, election commissioner Pakorn Mahannop said on Friday.
He was responding to ongoing criticism of the delay in announcing the results and doubts about the Election Commission's formula for calculating the final number of House seats won by political parties.
Mr Pakorn told reporters there were nearly 300 complaints and all of them must be investigated. They included complaints against prospective winners in 66 constituencies.
The EC had also ordered recounts at two polling stations in Khon Kaen province and re-voting at six polling stations in five provinces, he said.
Mr Pakorn said the organic law on the election of MPs prohibited the early declaration of results in constituencies where there were no complaints, or where an investigation was concluded.
The EC had only one formula to calculate the number of list-MPs of individual political parties. However, it could not start the calculation right away, not until the complaints were settled, Mr Pakorn said.
"Nationwide votes to be used in the calculation will change due to the orders for vote recounts and re-voting... If the inquiry finds grounds, candidates will be suspended and the vote will change. When the figures are settled, we can announce the final tallies of list-MPs within 10 minutes," the election commissioner said.
"We are speeding up the work and proving that the election is transparent and fair. Those who think differently can file complaints. If our investigation is unclear or illegal, the EC can be accused then," Mr Pakorn said.
In response to calls for the election commissioners to resign, he said opponents had the right to do so and the EC was listening, but it still had a duty to ensure the transparency and fairness of the election.
He repeated assurances that the EC would announce a list of at least 95% of constituency MPs, representing 333 out of 350 constituencies, by May 9.