Boston Mayor Michelle Wu called the Kraft Group's proposed agreement over Revolution stadium an "unserious offer."

A battle of public opinion escalated Monday near the proposed New England Revolution soccer stadium as Boston Mayor Michelle Wu and Kraft Group leaders traded jabs over their talks.Between the lines: The strained negotiations spilled into public view with Wu blasting the developer for a lack of details about the Everett stadium's potential impact and a $750,

Boston officials remain at an impasse with the Kraft Group over a deal to offset the effects of a proposed New England Revolution soccer stadium.