General Mills(NEW YORK) — General Mills issued a major recall on Tuesday after its flour was linked to an E. coli outbreak across 20 states.

The food company is voluntarily pulling some of its Gold Medal, Wondra, and Signature Kitchens flour off the shelves after an investigation by the Centers for Disease Control and Prevention said that about half of the 38 cases of E. coli O121 had reported using those General Mills brands.

According to General Mills, tests found that there was no E. coli in its flour products or in its flour manufacturing facility. The company also said no consumers had reported illnesses related to the flour products to General Mills.

It is possible that some of the cases of E. coli were from consuming raw dough or batter, according to General Mills.

The E. coli O121 strain can cause intestinal bleeding, or hemorrhage, and is potentially deadly.

The affected flour products were sold from Aug. 23, 2016 to June 14, 2017 at Safeway, Albertsons, Jewel, Shaws, Vons, United, Randalls, and Acme.

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Source: Business