I'm looking for the CNN cite now. It was about a year ago.
Still looking for the ranch cite, but here's a CNN cite that should give you somewhere to start.
Remains of up to 5 people found on Mexican border ranch, may be mass grave of up to 100 people; see the inset for more disturbing info: http://archives.cnn.com/1999/WORLD/americas/12/01/mexico.mass.graves.01/index.html