TEHRAN, Jan. 24 (UPI) -- Iran could run out of yellowcake uranium within the next few months, forcing it to seek the nuclear fuel source elsewhere, sources say.
Unidentified diplomatic sources said with Iran running low on the uranium ore byproduct, countries such as Britain and the United States are taking steps to prevent the Middle East nation from obtaining more from major uranium producers, The Times of London reported Saturday.
Diplomats in Kazakhstan, Uzbekistan and Brazil have already received letters from Britain's Foreign and Commonwealth Office requesting that uranium-producing countries not to sell any to Iran.
Iran's depleting cache of yellowcake uranium was purchased from South Africa in the 1970s, The Times reported.
Uranium is a key component in the manufacturing of nuclear weapons, as well as for civilian electrical power production.
The Times said Iran has been struggling to produce enough uranium ore from its own mines to support its nuclear program.