Sky News' David Blevins speaks to the relatives of one of the victims, fifty years on from the Bloody Sunday massacre.

Thirteen people were killed and 15 others injured on 30 January 1972 when troops of the 1st Battalion of the Parachute Regiment fired on demonstrators during a civil rights march in Derry.

Family members say that many questions are unanswered, despite the findings of a public inquiry.

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