Another agency says it wants to look into the actions of its own employees in connection with the George Washington Bridge lane closure scandal.
The Port Authority is calling for an investigation into its police force.
This comes following reports that officers told frustrated drivers stuck in traffic to direct their complaints to the mayor of Fort Lee.
The fallout from the closures has engulfed the administration of New Jersey Governor Chris Christie.
The governor's aides are accused of orchestrating the massive traffic jam as political retribution against Fort Lee's mayor for refusing to endorse him.
Multiple investigations into the closures are underway, and several people have resigned their posts because of their involvement.
Christie himself denies any knowledge.