Mexican cargo train derails, at least 4 killed in Mexico City

MEXICO CITY (CNN) -- A cargo train derailed in southern Mexico on Sunday morning, killing at least four people and injuring dozens more, officials said.

Rescuers were at the scene in a remote area of Mexico's Tabasco state Sunday morning, civil protection officials said. At least 35 people were injured.

Authorities have not released details about the casualties or what caused the crash, which occurred around 3 a.m. in the municipality of Huimanguillo.

Mexico no longer has a nationwide passenger rail system, but thousands of Central American migrants stow away on freight trains heading north toward the United States.

On the train, nicknamed "The Beast" and "the train of death," they often huddle on rooftops and cram into spare spaces between cars.

CNN's Samuel Santamaria and Catherine E. Shoichet contributed to this report.

™ & © 2013 Cable News Network, Inc., a Time Warner Company. All rights reserved.