FBI agents and State Police on Wednesday descended on the home of Scott Ritter, a former United Nations weapons inspector who in June had his passport seized by the U.S. Department of State as he attempted to fly to Russia for a conference.

Shortly before noon, marked State Police vehicles and unmarked law enforcement cars lined up near Ritter’s Dover Drive home. Just before 5 p.m., authorities carried more than two dozen boxes out of the house.

After the agents and officers drove away, Ritter emerged from the home and briefly spoke with reporters. Dressed in shorts and a T-shirt with an image of the character Inigo Montoya from the 1987 fairy tale comedy “Princess Bride” on it, Ritter said the investigators were there to execute a search warrant “related to concerns apparently the U.S. government has about violations of the Foreign Agents Registration Act.” That federal law requires individuals and entities that represent foreign interests in the United States to register with the Department of Justice and disclose their activities.