Ava White: Sister Mia speaks about losing her sibling

Ava White's sister has spoken for the first time about her murder.

Mia White described the moment she found out her 12-year-old had been fatally stabbed by a teenage boy.

It later emerged Ava had been killed in a row over a Snapchat video.

Mia now hopes to launch a campaign to discourage youngsters from carrying knives.

Reporter: Rachel Stonehouse

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