A son of Humberto Moreira, a former governor and former president of Mexico's Institutional Revolutionary Party (PRI), was killed in north-eastern Mexico, authorities said.
"I am deeply sorry for the cowardly murder of Jose Eduardo Moreira," Mexican President Felipe Calderon said Thursday in his account on the social network Twitter.
Moreira, 25, was killed late Wednesday. He was a coordinator for social programmes in the Mexican state of Coahuila, and was found dead in a rural path near Ciudad Acuna, which lies directly across the border from the U.S. city of Del Rio, Texas.
Humberto Moreira was the governor of Coahuila from 2005-11, and his brother Ruben Moreira is the current governor.
Coahuila is one of the Mexican states hardest hit by organized crime violence, which has claimed around 60,000 lives in the country over the past six years.
The motive for the younger Moreira's death and the identities of the suspects remained unknown. Authorities were investigating the crime.
After the end of his mandate as governor, Humberto Moreira became president of the PRI, Mexico's biggest political party, which ruled the country from 1929-2000 and is set to return to power on Dec. 1. However, he resigned after only nine months amid a scandal over irregularities in contracts while he was governor of Coahuila.
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