(NEWSER) – FBI agents scouring the "crime scenes" at Oregon's Malheur National Wildlife Refuge since the occupiers surrendered have uncovered a trench filled with "significant amounts of human feces" on or next to a cultural site of the Burns Paiute Tribe.

"Occupiers appear to have excavated two large trenches and an improvised road on or adjacent to grounds containing sensitive artifacts," prosecutors write in a court document filed Tuesday, per Reuters. Occupiers had apparently set up a camp there. Authorities also found "large food stores that are spoiling'' and firearms and explosives, leading some to fear that vehicles and buildings "may be booby trapped," prosecutors say, per the Oregonian.

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