The mayor of a small town in northern Mexico near the US border and a group of officials have reportedly been freed.
Three members of the powerful Mexican Gulf Cartel are dead after a shootout and a car chase with law enforcement.
The Trump administration's protocols, in place since 2019, have pushed more than 65,000 asylum seekers back into Mexico to wait for their US court hearings.
Mexican and Guatemalan authorities have so far collected DNA samples from relatives of the suspected victims to determine whether the 19 bodies are those of a group of missing migrants.
Lawmakers are now rushing to try to meet a Dec. 15 deadline set by the Supreme Court for legalization aiming to remove the drug as a source of income for violent drug gangs.
Mexican news network Milenio said seven people were also injured in the shooting at the facility in Guanajuato state.
Mexico's president has ordered the armed forces to tackle security on the streets for another four years.
Security will be boosted at prisons in the state after the incident in the Varonil prison, which broke out around 2:30 pm on Tuesday afternoon, the government said.