"Very clearly, the question as to whether Sri Lanka is any longer capable of conducting a free and fair election has been raised in this election," the group said in a statement.
"It is not only the electoral process that is under challenge. The very process of receiving, preserving and counting the ballot at the commissioner’s office itself is an issue that has been prominently raised."
The defeated candidate, former army chief Sarath Fonseka, said Thursday he had already lodged a protest with the independent elections commission and would also petition the Supreme Court for an annulment of the result.
"We have already collected enough evidence of sophisticated vote-rigging at counting centres and at the time of the computer processing of the results," Fonseka told reporters at his Colombo hom