The daughter of late Mexican guerrilla leader Lucio Cabañas has requested help in leaving the country due to threats she and her family received following last month's killings of her mother and aunt.

"I'm here to ask for your support ... and to raise awareness among the left and human rights organizations (because) I don't know why they haven't attended to my case," Micaela Cabañas said in a press conference Tuesday in this capital, where she also complained about a lack of progress in the investigation into the murders of her kin.

Isabel and Reyna Ayala Nava, Micaela's mother and aunt, were killed on July 3 in Xaltianguis, some 10 kilometers (6 miles) from the Pacific resort city of Acapulco.

In the wake of the double homicide, Micaela Cabañas and 17 of her relatives were forced to leave their town in Guerrero state and take refuge in other parts of the country.

"They say there are two lines of investigation, but (authorities) haven't contacted me thus far," Cabañas, flanked by members of different grassroots organizations, said.

The murders occurred three days after a lawmaker proposed during a session of the state legislature in the southern state of Guerrero that a truth commission be established to probe disappearences during a decades-old "dirty war" against leftist rebels and their perceived allies, the Nacidos en la Tempestad (Born in a Tempest) association said in a statement.

Isabel Ayala belonged to the Party of the Poor that was founded by Lucio Cabañas, who died in a 1974 clash with Mexican army troops in Atoyac de Alvarez, Guerrero.

Ayala was held between 1974 and 1976 at a military prison before she was released by authorities on condition that she would not denounce her clandestine detention.

She saw the names there of "dozens of detainees written on the walls and overheard sessions in which prisoners were tortured," the statement said, adding that she was therefore a "key witness to those events."

Over the past two years, Ayala had taken part in public events to demand justice for the hundreds who disappeared during the Mexican government's dirty war against the left.

According to AFADEM, a group representing victims' families, slightly more than 450 people have been registered as missing since 1978 in the town of Atoyac de Alvarez alone, a figure that rises to "more than 650" when taking into account other disappearances detected in other parts of Guerrero.

"There's no guerrilla figure as emblematic as Lucio Cabañas; more than 150 (members) of his family went missing and the murder of his wife could be ... a very clear message to those demanding justice for all (those past crimes) that we stop doing so," Raul Alvarez Garin said.

The activist added that while "Micaela's safety is a priority," he and his colleagues cannot stop "demanding that (authorities) clear up those crimes of 30 years ago."