The 20-second video, taken by one the brothers, who were aged ten and 11 at the time, showed his sibling taunting and hitting one of his victims as he lay on the ground covered in blood.
Family members of the two victims, who were then aged nine and 11, broke down in tears and there were audible gasps from the public gallery as the film was played to Sheffield Crown Court yesterday.
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Hide AdMr Justice Keith began a three-day sentencing exercise after the brothers admitted a number of charges in connection with the attack in April last year.