General Mills has expanded its recall of Gold Medal, Wondra and Signature Kitchens flour products as it continues to work with federal officials who are investigating a multistate outbreak of E. coli. General Mills first issued a recall last month for approximately 10 million pounds of flour.

The company says the recall is being expanded due to a newly reported illness that appears to have stemmed from the consumption of raw dough or batter linked to flour produced last fall. A recent guidance released by FDA warned consumers about the food safety risk of eating raw products made with flour.

State and federal authorities have been researching 42 occurrences of illnesses across 21 states related to a specific type of E. coli (E. coli O121), between Dec. 21, 2015, and June 8. According to the CDC, investigators determined flour produced at the General Mills facility in Kansas City, Missouri is a likely source of the outbreak.