Honduras - Honduras has called Ecuador President Rafael Correa "irresponsible" for revealing that a second person survived a massacre in Mexico last month.
Honduran Foreign Minister Mario Canahuati said Mr Correa had risked the life of the survivor, a Honduran.
The person has been under witness protection since the massacre, in which 72 migrants were killed near Mexico's US border, allegedly by a drugs gang.
Ecuador has dismissed the criticism as unacceptable.
Until Tuesday, just one survivor of the massacre was known to the public - Freddy Lala Pomavilla, a teenage Ecuadorean who alerted the authorities to the atrocity.
But Mr Correa revealed on Tuesday that Mr Lala had told the authorities that another person had survived.
Ricardo Najera, from the Mexican Attorney General's office, later confirmed Mr Correa's statement, adding that the second survivor was unhurt and had offered "important information" on the attack.
Mr Lala has already told officials how the notorious Zetas drug cartel had captured them in Tamaulipas state.
The authorities suspect that the Zetas killed the migrants after they refused to smuggle drugs into the US.