Mexico Investigates Journalist's Killing in Southern State

Mexican authorities on Friday were investigating the murder of a journalist in the southeastern state of Tabasco, as a prominent press watchdog group expressed concern over the killing and urged transparency in the probe.

Ismael Diaz Lopez was stabbed to death in the chest Thursday in Teapa, south of the state capital of Villahermosa, the Tabasco prosecutor's office reported via Twitter.

It added that that the strongest line of investigation suggests a possible family conflict, given a prior legal history that it did not specify.

The newspaper El Criollo, Diaz Lopez's employer, wrote that he had been involved in a domestic dispute.

The Inter American Press Association acknowledged that the facts behind the killing are not certain, but urged an exhaustive investigation "to determine whether the motive for the crime is connected to the victim's work and to punish those responsible."

The IAPA said Diaz Lopez, who worked for El Criollo and the newspaper Tabasco Hoy, was slain inside his home by unknown intruders.

According to the United Nations and the Organization of American States, Mexico is one of the most dangerous countries in the world for journalists.