A worker arranges bread for sale inside a supermarket in Zimbabwe's capital Harare March 26, 2009.

Zimbabwe could run out of bread in a week after flour stocks dwindled due to the country’s failure to pay for imported wheat, according to a confidential letter written to bakers by the country’s grain millers’ group on Monday.

The southern African nation is in the grip of a severe shortage of U.S. dollars that has sapped supplies of fuel and drugs, as President Emmerson Mnangagwa struggles to live up to pre-election promises to quickly revive the troubled economy.

Zimbabwe imports wheat, which it blends with its local crop to make flour for bread, the country’s second major staple after maize meal.