The body of Mexican reporter Rene Orta Salgado was found over the weekend by police in the trunk of his car in the central state of Morelos, prosecutors said.

The journalist's face was covered with a bandanna and "there were apparently no wounds from firearms," the Morelos Attorney General's Office said.

Orta Salgado's body was discovered Sunday afternoon in a neighborhood in Cuernavaca, the capital of Morelos, located about 90 kilometers (some 55 miles) from Mexico City, the AG's office said.

The vehicle "did not have any impacts from firearms, nor traces of blood or signs of violence in its interior or exterior," the AG's office said.

Orta Salgado's relatives identified his body and an autopsy will be conducted to determine the cause of death, the AG's office said.

The journalist was reported missing by his family on Saturday, prosecutors said.

Relatives told authorities that Orta Salgado was last seen at an establishment in the northern section of Cuernavaca Friday night and early Saturday, the AG's office said.

Orta Salgado organized a group last December to help elect Institutional Revolutionary Party, or PRI, presidential candidate Enrique Peña Nieto, media reports said.

Two other attacks on journalists and media outlets were reported in the past few days.

Over the weekend, the National Human Rights Commission, or CNDH, said it was investigating the attack last week on journalist Gerardo Ponce de Leon in Hermosillo, the capital of the northern state of Sonora.

Ponce, editor of the Marquesina Politica news Web site, was beaten by two unidentified men last Thursday.

Attacks on journalists "are systematic in Mexico" and the issue gets little attention, with inadequate justice in cases involving attacks or abuses of power against journalists, the CNDH said.

A total of 580 complaints have been received from journalists since 2005 and 69 protective orders have been issued, the commission said.

The El Mañana newspaper in Nuevo Laredo, a border city in northern Mexico, was attacked on Friday night.

Gunmen threw a fragmentation grenade at the newspaper's offices and opened fire on the front of the building, damaging the structure and three vehicles parked outside.

This is the second time that El Mañana is the target of a grenade attack.

Gunmen attacked the newspaper on Feb. 26, 2007, seriously wounding reporter Jaime Orozco, who was shot in the back and left paralyzed.

Mexico, where nearly 80 journalists have been murdered and several others have disappeared since 2000, is considered the world's second most dangerous country for members of the media.