Boston Mayor Michelle Wu openly criticized the Kraft Group for its handling of a proposed soccer stadium for the New England Revolution in Everett.

Framed by the backdrop of industrial Everett — the proposed site of a future Revolution soccer stadium — Boston Mayor Michelle Wu stood at a Monday morning press conference in Charlestown and advocated against what she called an “unserious offer” from the Kraft Group.

With the stadium property as a backdrop across the Mystic River, Wu on Monday held a press conference in Charlestown to express frustration with the slow progress of talks so far. The event came two weeks after Wu’s planning chief,