The Food and Drug Administration said it’s beginning an “across the board” investigation into human foods that contain wheat gluten.

In recent weeks, contaminated wheat gluten in some pet food has been blamed for illnesses and deaths of cats and dogs.

An FDA spokesman said Safeway recently held up distribution of certain foods, including bread, so it could be tested.

“I’d guess I’d rather they be more prudent that way,” said Anne Verhoeven, a shopper at Safeway. “I’d hate to have somebody elderly dying because it did something to them. The pet food thing is enough.”

A WinCo store in Hillsboro also withheld some of its bread for testing. A worker there told FOX 12 on Sunday that “due to the possible recall of certain ingredients, they are pulling certain products off the shelves until the FDA says everything is safe.”

So far, the agency reports no toxins found in the food.

FDA Begins Testing Foods With Wheat Gluten