In Mexico, those searching for missing relatives can vanish too

Mexican grandmother Maria Herrera has been looking for her four missing sons for years: two of them disappeared while searching for the other two who vanished years before -- all of them are believed to have been killed by drug gangs and their allies. [AFP]

Maria Herrera is scraping at the earth on a hill in the town of Huitzuco, in southern Mexico, looking for the mounds or sunken spots that indicate a decaying corpse.

At 70 years old, Herrera is hoping against all odds to find her four missing sons -- two who disappeared in 2008, and two who vanished in 2010 looking for their brothers.