A 54-year-old woman has been arrested by South Wales Police over allegations relating to election offences.
She was arrested in Swansea on Saturday and interviewed but was later released on bail pending further enquiries.
Police are also investigating an alleged case of election fraud in the city involving a forged signature on a Conservative nomination paper.
A Tory council candidate has resigned. It is understood the electoral fraud case is not related to his nomination.
Norman Whitlock was responsible for overseeing nominations for a number of candidates in the Swansea area.
The Conservative party said following Mr Whitlock's resignation on Wednesday it had begun its own inquiry.
Mr Whitlock is still standing as a candidate as it was too late for his name to be withdrawn, a party spokesman said.
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