Ten indigenous musicians were shot dead and burned in an ambush in western Mexico.

The horrible crime is believed to have been carried out by a drug cartel, that has been terrorizing indigenous groups in Guerrero Mexico for nearly 20 years.

The members of the Nahua indigenous group were returning from a party when they were attacked in the town of Chilapa in Guerrero state.

The victims, part of the Sensación Musical group, were returning to their Alcozacán community on Friday after playing the day before, said David Sánchez Luna, co-ordinator of the regional indigenous group known as CRAC-PF. Gunmen attacked their vehicle at around 14:00 local time in Mexcalcingo, he said. The victims, all men, were aged between 15 and 42.

The ‘Los Ardillos cartel’, which frequently targets indigenous people in the area, was blamed for the attack.

For over 20 years, Los Ardillos have been trafficking drugs in the mountainous region of Guerrero —throughout this time they have infamously extorted and kidnapped locals to consolidate their power and domain.

The rural ex-cop Celso Ortega Rosas, nicknamed ‘La Ardilla’, was involved in the business of poppy crops in the region of Quechultenango Guerrero, and he is the founder of the criminal group.

According to a 2015 article on El Universal, los Ardillos started kidnapping and extorting people. They gave their victims a 24 hour period to vacate their homes before taking possession of the property.  In 2008, Celso Ortega Rosas was detained for the kidnapping of a woman, the homicide of two agents of the former ‘Subprocuraduría de Investigación Especializada en Delincuencia Organizada (SEIDO)’ a body that has since dissolved and was focused on undercover investigations in the center of Guerrero state.

When the bodies of the victims were found, they were beyond recognition.

After authorities refused to release them to the families, hundreds of indigenous people blocked a road on Friday night, according to La Jornada newspaper.

Authorities shared the names of the deceased victims.

The men who lost their lives were: José Julio y Cándido Fiscaleño Hilario; Crescenciano Migueleño Coapango; Israel Tolentino Ahuelican; Israel Mendoza Pasado; Regino Fiscaleño Chautla; Antonio Mendoza Tolentino; Lorenzo Linares Jiménez; Juan Joaquín; y Marcos Fiscaleño Baltazar.

The Guerrero prosecutor’s office said it was investigating the case.

Guerrero is one of Mexico’s most violent states, where drug gangs fight for control of trafficking routes to the Pacific and other parts of the country. Los Ardillos have been linked to dozens of deaths in recent months, including many indigenous people, according to local media.

President Andrés Manuel López Obrador has opted for a non-confrontational approach to the cartel.

Focusing, instead, on tackling inequality central to his efforts under a policy dubbed “abrazos, no balazos” – hugs not bullets. But this policy has come under fire after a number of high-profile attacks, including an ambush in which nine members of a Mormon community were killed. The president vowed to create a new National Guard to tackle violence, but few have signed up to the force amid fear of being killed on the job.