Officials discover mass graves in Mexico - where the remains of at least twenty men have been recovered.
Mexican authorities said on Monday most of the victims have been dead for about two years.
All were males between the ages of 18 and 40.
At least 15 graves were found during a search that began on Friday - near the city of Ciudad Juarez in the state of Chihuahua.
The U.S. - Mexico border state has been one of the hardest hit by violence stemming from drug wars.
The victims appeared to suffer asphyxiation, head trauma or were shot.
Mass graves found in Mexico (0:38)
Nov. 26 - Officials discovered mass graves in the U.S - Mexican border state of Chihuahua where the remains of at least twenty men have been recovered. Sarah Irwin reports. ( Transcript )