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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The decision comes after a campaign led by Plaid Cymru and Rhondda Cynon Taf councillor Elyn Stephens to eradicate period poverty.