A suspect has been arrested on suspicion of sexual assault at a playgroup, police have said.
St Padarn's Playgroup in Aberystwyth, Mid Wales, has been temporarily closed pending further investigation and police said this would be reviewed on a daily basis.
The playgroup is registered by the Care and Social Services Inspectorate Wales (CSSIW), Dyfed Powys police said. It is independent of St Padarn's Roman Catholic school.
The suspect was released on bail and the playgroup shut.
Keith Evans, leader of Ceredigion County Council, said the allegations were something "you hope never happens in your community". He added the playgroup was privately owned, rather than run by the council.
In a joint statement, Dyfed Powys Police and Ceredigion Local Safeguarding Children's Board said: "A multi-agency meeting has been held, in line with the All Wales Child Protection Procedures and Working Together Welsh Assembly Government guidance.
Parents wishing to make alternative childcare arrangements were directed to www.cis.ceredigion.gov.uk.
"Ceredigion Social Services is making staff available to offer help and support to families via the contact centre on 01545 574 000, the joint statement said.
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"Dyfed Powys Police take any allegation of this kind seriously and have specially trained officers to deal with any victims and any alleged offenders. Anyone with information can contact Dyfed Powys Police via 101."
