The bodies of two young people were found hanging under a pedestrian bridge in the Mexican border city of Nuevo Laredo in retaliation for using social media to report a crime.
A message with the bodies warned: "This is going to happen to all of those posting silly things on the internet."
It was signed with the letter Z, alluding to the Los Zetas criminal organisation.
People have started to use Twitter to report on criminal activities along the US-Mexico border because of self-censorship by local media fearing reprisals from drug cartels.
Sources: Christian Science Monitor/CNN
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