Five men have been arrested over an allegation of a child being sexually assaulted at a day nursery.
West Mercia Police said officers detained the men after a very young child told their family about an incident reported to have happened last week.
The incident is said to have taken place at one of the premises of Bright Eyes Nurseries and officers have been searching three branches run by the operator in Bromsgrove, Redditch and Droitwich, all in Worcestershire, England.
Three other properties have also been searched.
Superintendent Kevin Purcell, of West Mercia Police, said: "A young child has made a disclosure that we are taking extremely seriously.
"We are also treating it as sensitively as possible due to the nature of the offence and the very young age of the child involved.
"Our primary concern is their welfare as well as that of the other children who attend the nurseries.
"We are working with our partner agencies in the Worcestershire Safeguarding Children Board as part of our response.
"The investigation is at its early stages and five men have been arrested as we endeavour to identify the person responsible for the assault.
"We fully understand how concerning this disclosure will be to those people whose children attend Bright Eyes Nurseries, as well as the wider community.
"All parents and carers who have visited the nurseries today were given a letter explaining, as far as possible, the reasons for our activities, while police staff are available to discuss any immediate worries they may have."
The five men are in police custody awaiting questioning.