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Undated photos made available by the Arkansas Department of Corrections show Jack Jones Jr (left) and Marcel Williams who were executed by lethal injection r in the Cummins Unit prison in Lincoln County, Arkansas, on Monday. Photo: EPA

Arkansas carries out first US double execution for 16 years

The first double execution to take place in the US in 16 years was carried out by Arkansas on Monday night amid a fierce dispute over whether the prisoners were subjected to a botched procedure amounting to cruel and unusual punishment.