The police station at Northern Illinois University was locked down Wednesday as special agents from the FBI and state police served a search warrant there.

The FBI is the lead investigating agency in the incident, and is operating in conjunction with the U.S. Department of Education's Office of the Inspector General, and the U.S. Department of Housing and Urban Development's Office of Inspector General, officials said.

The inspector generals at federal agencies typically investigate alleged fraud or waste of agency funds or in agency programs.