Intentional tampering cannot be ruled out as the cause for repeated flaws in the electoral roll, said Bersih chairperson Maria Chin Abdullah.

"While some inaccuracies can be put down to honest human error given the flawed system, Bersih will not rule out intentional tampering to tip the scales to favour certain political parties in elections as the occurrence of such mistakes are happening repeatedly," she said in a press conference in Petaling Jaya today.

One of the examples of mistakes that occur repeatedly are voters in the same household who are registered in different localities, state or parliamentary seats, Maria said.