The families of those killed on Bloody Sunday have told how they will continue to fight for justice "until their final breath" 50 years after Derry's darkest day.
On January 30, 1972, thousands of men, women and children took to the streets of Derry in an atmosphere of heightened tensions - but also hope.
The march had been organised over a new law that had been introduced to detain people without trial indefinitely - otherwise known as internment.
