U.S. authorities charged five Chinese nationals with lying and trying to cover their tracks, more than a year after they were confronted in the dark near a remote Michigan military site where thousands of people had gathered for summer drills.

The five, who were University of Michigan students at the time, were not charged for what happened at Camp Grayling in August 2023. Rather they are accused of misleading investigators about the trip and conspiring to clear their phones of photos, according to a criminal complaint filed in federal court.

The FBI noted in the Tuesday court filing that there have been instances of college students from China taking photos of vital defense sites in the United States.