The cantonal prosecutor, Olivier Jornot, said that a preliminary examination showed no signs of fraud or corruption in Geneva’s election services.
A suspect who was detained by police last Thursday was released before the weekend, Jornot told a news conference on Monday.
He added that a personal conflict between two employees of the election services was probably the reason for the fraud and corruption allegations.
The affair came to light last week following reports about police searching the cantonal election offices.
The news came less than ten days before voters in Geneva are due to decide on nine cantonal and two national issues.
The political authorities in Geneva are under increasing pressure amid a conflict involving the former head of the Geneva cantonal government, Pierre Maudet.
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Nemo brought the Eurovision Song Contest to Switzerland with a victory on Saturday evening in Malmö, Sweden. It is Switzerland's third victory in the history of the music contest.
Switzerland abstains from vote on Palestinian bid for full UN membership
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On Friday, Switzerland abstained from the vote at the General Assembly on granting the Palestinians new rights at the United Nations (UN).
Protein in abdominal fat could help shape obesity treatment
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The study analysed fat cells from different locations in the body, and found that those in the abdomen have unique properties.
North African asylum claims fall after rapid Swiss processing
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The accelerated procedure, now out of its test phase, has resulted in a significant drop in applications from North African countries.
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The artist's song "The Code" focuses on their journey as a nonbinary individual. It is one of the favourites to win this year's contest.
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Police question Geneva electoral official in fraud case
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A probe into possible electoral fraud has been opened in Geneva, after reports that an employee in the elections office manipulated ballots.
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Two initiatives have been launched in Geneva that would permit a cantonal minister or magistrate to be removed from office.
Geneva parliament calls for embattled politician to step down
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Geneva's cantonal parliament has given the green light for further legal investigations into the controversial government member Pierre Maudet.
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If you want to start a conversation about a topic raised in this article or want to report factual errors, email us at english@swissinfo.ch.