Mexican troops say they have discovered 72 bodies at a ranch in the north of the country.
The bodies were found after a shoot-out with suspected drug cartel gunmen in which three gunmen and one marine were killed, the military said.
Unconfirmed reports say the 58 men and 14 women, found in Tamaulipas state, were migrants trying to reach the US.
More than 28,000 people have died in drug-related violence in Mexico over the last four years.
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"The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness."
-John Kenneth Galbraith