Nicholas Young, 36, of Fairfax, Va., was to appear in court Wednesday afternoon. He is the first U.S. police officer to face a terror-related charge.

Young, who was been an MTPD officer for 13 years, was first interviewed by investigators in September 2010 in connection with an acquaintance, Zachary Chesser, who had been arrested and subsequently pleaded guilty to attempting to provide material support to a designated foreign terrorist organization.

The 40-year-old transit system serves Washington, D.C., and parts of Virginia and Maryland.

Over the next several years, according to court records, Young allegedly had numerous interactions with undercover investigators and an FBI informant discussing his alleged knowledge and “interest in terrorism-related activity.’’ Many of the interactions were recorded, officials said.