Iran's nuclear advance may add to Western worries

VIENNA (Reuters) - Iran is making headway towards rolling out advanced uranium enrichment machines that could speed up its production of nuclear reactor fuel as well as weapons-grade material if, as the West fears, it ultimately tries to assemble atomic bombs.

But it remains unclear whether Tehran, under increasingly strict international sanctions that crimp its ability to import components, can manufacture the machines in the industrial-scale numbers needed to revolutionize its enrichment activity.