Mexican violence victims' relatives protested outside the interior ministry in this capital to denounce authorities' failure to bring their loved ones' killers to justice.

During Wednesday's demonstration, the protesters lamented that significant breakthroughs already have been made in the investigation into last week's murder of the son of a prominent Institutional Revolutionary Party, or PRI, politician, while their relatives' cases remain unsolved for months or years.

The more than 200 members of the Movement for Peace with Justice and Dignity, or MPJD, who gathered shortly before midday slammed President Felipe Calderon for unfulfilled promises.

They recalled he told them months ago that the federal Attorney General's Office and its Siedo organized crime unit would conduct investigations into several murders and disappearances brought to their attention, but no results have yet been obtained.

The president also pledged to create a National System for Attention to Victims, erect a memorial to victims and enact a General Law on Victims, which the president returned to Congress with a series of objections in July.

The MPJD said Calderon "has not complied with the memorial" nor with the "General Law on Victims" and that the organization he created to channel the demands of victims of violence, known as Provictima, is woefully lacking in funding.

The demonstrators also noted that in just one week significant strides have been made in the probe into the Oct. 3 murder of the 25-year-old Jose Eduardo Moreira, a regional coordinator of social development programs in Coahuila and son of former PRI chairman Humberto Moreira.

A massive investigation was launched in the wake of his murder, including the deployment of army soldiers, federal police and state and federal investigators to solve the case and track down the perpetrators.

"If our relatives had these surnames then they'd have the attention of Felipe Calderon and (interior secretary Alejandro Poire)," the MPJD said.

The movement said its wants a direct dialogue with the federal government and the states concerning unresolved cases, a report on results obtained in 30 investigations and more attention to victims.

During the protest, several activists wrapped themselves in black thread from head to foot to symbolize how the identities of Mexico's dead and missing have been erased.

The demonstrators also held up signs denouncing violence and expressing the profound pain they feel at the loss of their loved ones.

Poet-turned-peace activist Javier Sicilia launched the MPJD in April 2011, shortly after the murder of his 24-year-old son, Juan Francisco, and six of his friends in Temixco, Morelos state, by suspected drug-cartel members.

The group, which has carried out various marches in Mexico and recently wrapped up a tour of the United States, is demanding a halt to Calderon's drug-war strategy based on deploying tens of thousands of army soldiers and federal police on the streets of crime-wracked cities and towns.

Human rights activists in Mexico and the United States say the military deployment has only exacerbated the security problem in Mexico, where conflict among drug cartels and between criminals and the security forces have claimed some 60,000 lives since Calderon took office in December 2006. EFE