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In aftermath of Monterrey massacre, speculation about where the victims came from

Julio Cesar Aguilar/AFP/GettyImages

Mexican officers block the road between Reynosa on the U.S.-Mexico border and Monterrey, May 13, 2012

It's too soon to draw any conclusions about where the 49 people found dead in northern Mexico near the city of Monterrey yesterday, their headless bodies dumped on a highway, may have come from.

But there's been some speculation that they could have been from outside the area. In an on-air interview this morning with KPCC's Madeleine Brand, Reuters reporter and author Ioan Grillo mentioned a lack of people coming forward to report loved ones missing, and how this has "raised a question if they were from this area, or outside, possibly migrants, possibly the countryside."

Spray-painted near the crime scene was a letter "Z," suggesting involvement of the Zetas drug cartel. The discovery was the third in a string of recent massacres in the area tied to a war between the Zetas and a rival drug gang.