Four types of Duncan Hines cake mixes have been voluntarily recalled by parent company Conagra Brands over the potential risk of salmonella contamination. During an investigation into a salmonella outbreak, the Food & Drug Administration and Centers for Disease Control and Prevention found salmonella in a sample of Duncan Hines Classic White cake mix. As a result, Conagra says it has voluntarily recalled about 2.4 million boxes of cake mix, including Classic White and three other varieties (Classic Butter Golden, Signature Confetti and Classic Yellow) made during the same time period out of an abundance of caution.

“We are recalling these products out of an abundance of caution and always encourage consumers to follow baking instructions provided,” the company said in a statement

Five cases of salmonella are being investigated, and multiple individuals involved reported consuming a cake mix at some point prior to becoming ill. Some may have consumed these products raw and not baked, the FDA says.