The muggers then ran off shouting the words 'Castlefields clan'.
The victims believe their attackers had followed them for some distance and had seen them loitering nearby when they left the party.
The attackers were both white and in their teens.
One had chipped rotten teeth and spoke with a 'plastic' scouse accent. He wore a black hoody and dark coloured tracksuit bottoms and trainers. He had brown eyes and dark hair.
His accomplice wore a blue and white hooded top. He had blue yes, a dark skinhead haircut and was about 15-years-old.
Anyone with information should contact Det Cons Spaven or Det Cons Gallagher on 01244 614975.
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