MEXICO CITY (AP) _ A special commission of the Inter-American Press Association said Tuesday the murder of a journalist here this month must not go unpunished, and urged authorities to give priority to finding the killers.

Ignacio Mendoza Castillo, 52, was shot three times in front of his house on Nov. 13. Mendoza was former editor of the Voz del Caribe, or Caribbean Voice, newspaper of the southeastern state of Quintana Roo. He moved to Mexico City because of death threats.

No arrests have been reported.

In Quintana Roo, Mendoza made accusations of corruption that included state Gov. Miguel Borge Martin. The IAPA investigation showed that Mendoza reported that a brother of the governor was operating a newspaper, El Diario de Quintana Roo, with public funds.

The nine-member commission, led by Alejandro Junco de la Vega, director of the Monterrey, Mexico, newspaper El Norte, visited Quintana Roo in investigating the shooting.

Human rights activists say at least 28 journalists have been killed in Mexico since 1988.

The commission said Tuesday in its report on Mendoza's death, ''Whoever is responsible and for whatever reason the killer must be brought to justice as soon as possible.''

Junco de la Vega said the commission met for two hours with Gov. Borge Martin, who denied any involvement in Mendoza's death.

Commission members were David Asman of The Wall Street Journal, Robert Hardie of Freedom Newspapers, David Lawrence of the Miami Herald, Gerardo Lopez of La Opinion of Los Angeles, Edward Seaton of Seaton Newspapers, Hector Davalos and Andres Garcia Levin of Mexico's Novedades group, Enrique Gomez of the Newspaper A.M. de Leon, and Junco de la Vega.