The Sweden Democrats' party secretary Mattias Bäckström Johansson tells the radio that the situation is worrying.
It is a very serious situation that has arisen, it is about the credibility of our electoral system and perhaps the election that will be the closest in modern times, he says.
Around 4,000 voters have been mistakenly marked off twice during voting or had their votes marked off for another voter.
The Election Authority received information on Tuesday afternoon from Nynäshamn Municipality, which had discovered the technical error. The authority told TT on Friday that it is working to minimise the consequences for the election result.
