Mexico's National Human Rights Commission (CNDH) reported Tuesday that roughly 80 people who entered the country with the caravan of Central American migrants bound for the United States have gone missing.

"Two buses have disappeared, so we're taking precautionary measures to find these people and keep them safe," CNDH official Edgar Corzo told a press conference.

He said that somebody reported the disappearance to authorities in the southern state of Oaxaca.

The buses were last seen in Isla, a town in neighboring Veracruz state, where CNDH personnel are "seeking information and questioning everyone," Corzo said.

Oaxaca's public ombud, Arturo Peimbert Calvo, put the number of missing migrants at 100.

"We're in the middle of an emergency. Since Saturday, Nov. 3, around 100 migrants in the exodus have been reported as disappeared after boarding two buses in inhumane conditions," he wrote Tuesday on Twitter.

Corzo recalled that they had warned migrants and authorities that it was "a pretty complicated route in terms of security," particularly because of the "risks of organized crime."

About the work undertaken by the Mexican government and the Federal Police in this emergency, Corzo said their operation has been "more defensive than one of humanitarian aid."

As for the situation of migrants staying in a shelter provided for them at a soccer stadium in Mexico City, the CNDH warned that "there's disorganization and matters of hygiene and healthcare are not being sufficiently dealt with."