Attorney General Pam Bondi says the search of a Washington Post reporter’s home was done at the Pentagon’s request as part of a leak investigation.

The warrant says the search was related to an investigation into a system engineer and information technology specialist for a government contractor in Maryland who authorities allege took home classified materials, the Post reported. The worker, Aurelio Perez-Lugones, was charged earlier this month with unlawful retention of national defense information, according to court papers. He has not been charged with sharing classified information, and he has not been accused in court papers with leaking.

Perez-Lugones, who held a top secret security clearance, is accused of printing classified and sensitive reports at work. In a search of his Maryland home and car this month, authorities found documents marked “SECRET,” including one in a lunchbox, according to court papers.

An FBI spokesperson declined to comment on Wednesday. The Washington Post said Wednesday that it was monitoring and reviewing the situation. An email seeking comment was sent to lawyers for Perez-Lugones, who is expected to appear in court on Thursday for a detention hearing.

First Amendment groups expressed alarm at the search, saying it could chill investigative journalism that holds government officials to account.