Gibson, Dunn & Crutcher, the firm N.J. Gov. Chris Christie tasked with investigating his administration’s possible complicity in the Bridgegate scandal, issued a 360-page report Thursday that cleared the governor’s office and laid blame squarely on a former aide and a Port Authority staffer.

At a press conference at the firm’s New York offices, partner Randy Mastro said Christie had “no knowledge beforehand” of the plan to close access lanes to the George Washington Bridge in Fort Lee last September and “played no role whatsoever” in executing that plan.