South Wales Police have arrested a 21-year-old man on suspicion of criminal damage and assault after an incident at a Neath mosque in the early hours of Friday morning.
A number of windows on the building were smashed, and a 44-year-old woman and a 48-year-old man were assaulted.
The man, who police say lives locally, remains in custody while an investigation is carried out.
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Showers expected throughout the day especially in the north. Drier and brighter elsewhere but cooler than in recent days.
Most places will become dry overnight, although it will remain generally cloudy with patches of hill fog.
Police have told people in Pontypridd that the cordon around the rugby club could be in place until next week.