Police are investigating a report that a four-year-old girl was sexually assaulted at a children's play centre in Lancaster.
The alleged attack took place at The Zone on Dalton Square on Saturday. The girl told her parents she was assaulted while playing.
A 13-year-old boy from Lancaster has been arrested on suspicion of sexual assault and released on bail pending further inquiries.
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Police believe the incident is isolated and have appealed for any witnesses who were at the centre to come forward.
