BOSTON—In the ever escalating war of words and legal documents between Las Vegas-based developer Steve Wynn and Boston government officials, Wynn has filed suit charging libel against an unnamed opponent of his planned $1.7-billion Everett, MA casino.

Wynn Resorts chairman Steve Wynn filed a lawsuit on Monday in Suffolk County Superior Court. The suit, according to a report in the Boston Globe, charges the unnamed foe with libel for allegedly distributing to the media subpoenas issued in connection with the City of Boston's ongoing litigation against the Massachusetts Gaming Commission's selection of Wynn Resorts' proposed casino project in Everett.

In a prepared statement, Wynn although not mentioning Boston Mayor Martin Walsh or his administration, lashed out at those that may have distributed the subpoenas to the press. “Although our commitment to Massachusetts is absolute and irrevocable, our tolerance for mean-spirited, libelous statements has exceeded any reasonable limit. Someone knowingly disseminated sham subpoenas containing falsehoods—outright lies—designed to interfere with our license granted by the Gaming Commission and defame our reputation," he says. "We intend to identify the malicious individuals who did this and call them to account.”