http://www.borderlandbeat.com/2019/01/up-to-20-bodies-found-burned-in.html?

One commenter pointed out it looks like a military operation. Burning the bodies was unusual too. Speculation though?

Up to 20 bodies found burned in Tamaulipas after clash between CDN and CDG.

"According to reports, the massacre was due to the war allegedly sustained by the CDN and CDG cartels on the Tamaulipas border with the United States.

According to reliable sources of social networks, the killing was the result of an armed confrontation that took place last night in the municipality of Miguel Alemàn, until today when elements of the SEDENA discovered the burned bodies after a journey through gaps in the municipality described.

This conclusion was reached because they found evidence of a confrontation between the two antagonistic criminal groups."