Federal prosecutors and FBI agents investigating the Bridgegate scandal questioned New Jersey Gov. Chris Christie for more than two hours last month, ABC News reported Friday.

According to the report, Christie voluntarily agreed to be interviewed about the lane-closing scandal, which was described by ABC as signaling an imminent conclusion to the year-long federal investigation headed by U.S. Attorney Paul Fishman.

New Jersey Gov. Chris Christie. (AP Photo/Julio Cortez)

ABC quoted Christie spokeswoman Maria Comella as saying Christie has always promised full cooperation with the criminal investigation and "is very much looking forward" to its conclusion.

Christie has maintained he had no involvement in or prior knowledge of the politically-motivated lane-closings and a joint state legislative committee has failed to uncover any evidence to contradict his claim.

A report by an outside law firm, hired by the governor's office, maintained that the lane closings appeared to have been instigated by Christie's deputy chief of staff, Bridget Kelly and Port Authority official David Wildstein.

Kelly was later fired by Christie, who said she had lied about her involvement. Wildstein was forced to resign his Port Authority post. Both appeared before the legislative committee but declined to answer questions about the allegations.