A five-year-old girl and her three-year-old brother whose bodies were found in a house in north Wales were killed by asphyxiation, police said today.
Their father (35) has been arrested on suspicion of murder.
A police spokeswoman denied reports that Caitlin and Aidan Samuel had drowned in a bathtub.
They died on Sunday evening in the small town of Bodelwyddan. Officers were called to their house in Coronation Close by an occupant and arrived shortly before 11pm.
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The children were taken to hospital where they were pronounced dead less than an hour later. Their father was arrested shortly afterwards.