Former Coahuila state Gov. Humberto Moreira said the murder of his son was an act of revenge for the death at police hands of the nephew of a top leader of the Los Zetas drug cartel.

Prosecutors told him that his son, Jose Eduardo Moreira Rodriguez, had been killed on the orders of Zetas boss Miguel Angel Treviño Morales, the elder Moreira said in an interview with Radio Formula.

After Treviño's nephew was killed in a shootout with state police on Oct. 3, "the order was given to kill a nephew of the governor ... and it was my son they killed," Humberto Moreira said.

Ruben Moreira, Humberto's brother, is the current governor of Coahuila.

Jose Eduardo Moreira Rodriguez, 25, a regional coordinator of social development programs for the state government, was killed near the Mexico-U.S. border just hours after the death of Treviño's nephew.

Three suspects - two of them municipal police - are in custody in connection with Moreira Rodriguez's murder.

Besides thanking authorities for their efforts to track down his son's killers, Humberto Moreira hailed poet-turned-activist Javier Sicilia, who launched a campaign against the Mexican government's military-oriented drug strategy after his own son was slain in 2010.

Moreira said Sicilia wrote him a letter of condolence on the death of Jose Eduardo.

"He and I had the opportunity, unfortunately, to bury our sons, but there are thousands of families who have never even seen their sons again, because they are missing," Moreira told Radio Formula.

More than 60,000 people have died in Mexico's drug war over the last six years.

With the death of Jose Eduardo, Moreira said his priority now is to join Sicilia's movement for "peace and justice." EFE