What is the fine-grained topic of the following text: On Monday, General Mills released an official statement announcing the voluntary recall of 1.8 million boxes of original yellow box Cheerios and Honey Nut Cheerios after wheat flour was accidentally introduced into the gluten-free oat flour system at the company's facility in Lodi, Calif.
General Mills found out about the problem when two consumers reported illnesses after eating Cheerios, while additional complaints were shared online, General Mills spokesperson Kirstie Foster told CNNMoney. Only return the topic.
General Mills' voluntary recall of Cheerios due to accidental introduction of wheat flour