A councillor has resigned after being arrested and cautioned by police for a "sexual offence".
Liberal Democrat Eric Griffiths, 64, has stood down less than a month after he was re-elected to Ceredigion council on 1 May.
Dyfed-Powys Police said a 64-year-old man was arrested and cautioned for a sexual offence on Saturday.
The leader of the council's Lib Dems confirmed Mr Griffiths, who represented Aberystwyth's Rheidol ward, had quit.
Mr Griffiths stood down at the weekend.
"I can confirm the resignation, which took place over the weekend," said Ceredig Davies. "I have no further statement to make at the moment."
A spokeswoman for Dyfed-Powys Police said: "On Saturday, 24 May a 64-year-old male from the Aberystwyth area was arrested and cautioned for a sexual offence."
Mr Griffiths was unavailable for comment.
Ceredigion council, which has a total of 42 seats, is run by a coalition of independents, Lib Dems and Labour.
Until Mr Griffiths's resignation, there were 10 Lib Dem councillors. His departure leaves the political make-up of the council finely balanced, with 21 members of the ruling coalition, and 20 others.