The injured young women were airlifted to hospital following the incident on the A4069 Llangadog to Brynamman road on Sunday at about 20:50 BST.
BBC: Location map
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The court heard on Monday how Bruce's friend William Davies took the gun and used it to kill Llangadog pub landlady Caroline Evans in February.
BBC: NEWS | UK | Wales | Murder gun owner is fined
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Carmarthenshire farmer William Davies, 59, is believed to have killed Caroline Evans, at the Red Lion in Llangadog on Thursday before turning the gun on himself.