A huge search was underway for those responsible for killing eight state police officers and five prosecution investigators in the rural area southwest of Mexico City.
Mexican president Andrés Manuel López Obrador, who says his symptoms are mild, joins a host of world leaders to have contracted COVID-19.
Some migrants threw rocks while authorities pushed the caravan back down the road with their riot shields. Migrants with children were more gently prodded back the way they had come.
The annual event usually attracts half a million visitors - this year it was reduced to 400.
Roads are left flooded and properties damaged after Hurricane Zeta battered popular Mexican beach resort Playa del Carmen.
“The most important part of my indigeneity that informs my climate work is that this is not an isolated issue."
Mexico has ordered 25 arrest warrants for those suspected to have been involved in the disappearance of 43 students six years ago including soldiers and police.
The 7.4 magnitude earthquake struck at 10:29 a.m. local time (5:29 pm CEST) on Tuesday, according to the US Geological Survey (USGS).
Brazil remains the area's worst-affected country with over 21,000 coronavirus-related deaths.
This is the latest in a series of mass alcohol poisonings registered since COVID-19 lockdowns began in the country.
The murder of Escamilla, whose body was mutilated and part of it flushed into the sewer, has horrified Mexicans.
It comes as they were blocked from crossing the Guatemala-Mexico border.
Hundreds of Central American migrants waded through the shallow Suchiate River from Guatemala into Mexic, in a new test of US President Donald Trump's “Central America” strategy to keep them away from the US border.