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 key components, can manufacture the machines in industrial-scale numbers that would revolutionize its enrichment activity.