The city of Boston has filed another lawsuit in its attempts to derail a planned $1.7 billion casino in neighboring Everett.

The lawsuit filed Monday challenges the validity of a key certification that Wynn Resorts needs to begin construction of the casino.

The Boston Globe (http://bit.ly/1L3QVib ) reports that the complaint filed in Suffolk Superior Court asks a judge to invalidate the environmental certification for the casino approved last month by the state secretary of energy and environmental affairs.

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The suit says Wynn and Secretary Matthew Beaton glossed over or ignored substantial concerns about how the resort casino and hotel would affect traffic, especially in Charlestown.

A Wynn spokesman, saying the company had not received the complaint, called the suit “an unproductive way for the city to engage in a dialogue with our company.”