Bimbo Bakeries USA has voluntarily recalled its Oroweat 100% Whole Wheat bread after it emerged that the product may contain tree nuts that are not listed on the label.

The bread was baked at the group's plant in Denver, Colorado and sold in five states - Iowa, Wyoming, Nebraska, Colorado and New Mexico. There was also "very limited" distribution in the Moab, Utah area.

No other Oroweat products are involved in the recall.