The ATF, U.S. Marshals and FBI have joined in the search for Jessica Chambers’ killer.

Chambers, 19, was burned alive nine days ago in Mississippi. 

Unmarked cars were seen earlier today at Chambers’ mother’s home. Authorities were taking photos and removing items from the home as well.

Chambers’ autopsy results are in, but are not being released because the investigation is still ongoing.

Soil samples were taken last week, but the results are not in yet.