April Jones' parents, brother and sister followed the horse-drawn hearse on the one mile journey from the Bryn-y-Gog estate to St Peter's Church in a car.
They were joined by hundreds of mourners on foot, with many wearing the schoolgirl's favourite colour pink.
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White House budget officials outlined the information during a telephone call with reporters given on condition of anonymity.
A prison officer is to be charged with gross negligence manslaughter and misconduct in public office in relation to the death of an inmate.