I sound like a broken record I know, but I can find nothing in this report
that uses as its source anything but official Mexican government and
military press releases. Likewise the US sources are all DEA.  In terms of
the people from Veracruz killed and dumped in the city las September, there
were numerous reports at the time from relatives of the dead that they were
not “Zetas” but rather ordinary street people, prostitutes, kids…
Also, a report from REFORMA at the time mentioned that the condition of the
bodies indicated that they had been captured and tortured by the military.
I am posting those articles below.

Evidencian ejecutados huella distinta al narco – Afirman que la forma en la que mataron a 35 no corresponde al crimen organizado