More than 60 CEOs of Minnesota-based companies signed an open letter posted on the Minnesota Chamber of Commerce website on Sunday calling for state, local and federal officials to work together, as businesses grapple with how to address tensions in the state and across the country following two fatal shootings by federal agents amid a massive immigration enforcement operation that has spurred protests. CEOs that signed the letter included 3M CEO William Brown, Best Buy CEO Corie Barry, General Mills CEO Jeff Harmening, Target incoming CEO Michael Fiddelke, UnitedHealth Group CEO Stephen Helmsley, and others. Over the past two weeks protesters have targeted some businesses they see as aiding federal immigration enforcement, including Minneapolis-based Target.