Iran's Arak reactor is growing nuclear concern for West

GENEVA (Reuters) - The still uncompleted Arak heavy-water reactor, seen by the West as a potential source of nuclear bomb fuel, has emerged as a big stumbling block in Iran's talks with six world powers on a deal to rein in its nuclear programme.

Iran denies Western accusations that it is seeking the capability to make atomic bombs and says the research reactor near the town of Arak, some 250 km (155 miles) southwest of the capital Tehran, will produce only radio-isotopes for medicine.