New Jersey Gov. Chris Christie's (R) press secretary appeared before a grand jury on Friday to testify in an investigation into his administration's possible involvement in suspicious lane closures on the George Washington Bridge, ABC News reported on Friday.

Mike Drewniak reportedly testified for more than two hours, though his attorney, Anthony Iacullo, told ABC that Drewniak was not being targeted in the probe. The grand jury was convened by the U.S. Attorney in New Jersey.

"I'm not going to get into the specifics as to what would be discussed in the grand jury," Iacullo said in a brief interview, as Drewniak stood behind him in silence. "I would say though that Mike is a witness and we have been assured that he continues to be a witness throughout these proceedings and Mike has continued to cooperate as requested by the government into this inquiry."

Iacullo refused to comment on whether his client knew whether Christie had any role in the September 2013 closings, which continue to hound Christie despite an internal investigation the prospective GOP presidential hopeful said has cleared him.

That investigation blamed the closings, which tied up traffic in Fort Lee, New Jersey, on former Christie staffers David Wildstein and Bridget Anne Kelly, neither of whom were interviewed during its compilation.

ABC reported that the 23 jurors will meet for up to the next 18 months, and will have the power to subpoena, indict and interview witnesses without their lawyers present.

Watch ABC's interview with Iacullo, as posted online on Friday, below.

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