 The Mexican authorities say at least 19 people have been killed in a clash between drug gangs in the southern state of Chiapas. Here's Ian McWilliam. The decaying bodies of the dead were found after members of the powerful Sinaloa drug cartel published a video boasting that they'd killed members of a rival drug gang calling itself the Chiapas and Guatemala cartel. The bodies were found in and around an abandoned cargo truck in the municipality of La Concordia near the border with Guatemala.