The attack is one of the worst mass slayings since President Andres Manuel Lopez Obrador took office 19 months ago pledging to reduce record levels of violence.
Police said the dumping of bullet-riddled bodies in different parts of the country indicates there is a fight going on between organised crime groups.
The clash involved members of the Sinaloa cartel – pitching part of the gang run by the children of ex-leader Joaquin "El Chapo" Guzman against members led by Ismael "El Mayo" Zambada, considered the group's number two, local media reported.
The area surrounding the popular Huatulco beach resort in the southern state of Oaxaca was hardest hit by the 7.4 magnitude quake, but the temblor was felt as far away as Mexico City.
Pemex, the state-run oil company, said the quake caused a fire at its refinery in the Pacific coast city of Salina Cruz, relatively near the epicenter. It said one worker was injured and the flames were quickly extinguished.
The state prosecutor acknowledged that there are still five graves pending analysis due to the lack of staff.
An unconfirmed number of bodies was found outside the Mexican city of Guadalajara in four different regions.
“It’s not easy to be away from your country. At times one only comes to suffer, to withstand mistreatment, hunger - and economically things aren’t good.”
Foreign visitors have begun to trickle back to the white sands and warm waters of Mexico's Caribbean coast as its popular beaches gradually reopen to tourism with new sanitary measures in place to prevent the spread of the coronavirus.
Guillermo del Toro, Alejandro Gonzalez Inarritu and Alfonso Cuaron launch Audiovisual Emergency Fund ("Sifonoforo") for anyone in movies in need of financial help amid the chaos caused by the coronavirus.
Nearly 200 migrants and refugees among a much larger group of Africans, Cubans and Haitians stranded by coronavirus pandemic in remote Darien region.
Business newspaper El Economista said the Mexican government asked the World Bank for the loan on May 19 to deal with the impact of the pandemic.
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