Hundreds of militarized Mexican police officers were standing guard Tuesday at the border between Piedras Negras, Coahuila, and Eagle Pass, Texas, to prevent nearly 2,000 Central American migrants from illegally crossing into the U.S.

Buses dropped off the migrants in Piedras Negras, a city of around 250,000 residents, late Monday. By Tuesday morning, federal police in full military gear were lined up in two long parallel rows outside of the facility to keep them from leaving the country, according to tweets from Mexican officials.

The Rio Grande separates both countries in that area, and due to the landscape, portions of the border do not have a physical barrier, making it easier for people to try to enter the U.S.

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Starting Tuesday, the state's governor, Miguel Riquelme, plans to begin deporting migrants who illegally entered Mexico on their way to America.

Coahuila officials will ask those staying at the temporary shelter to show humanitarian visas they would have received if they tried to travel through the country legally from Guatemala. Those who do not have the documents will be removed as soon as Tuesday.

Meanwhile, American, Mexican, and Central American officials are in talks about how to handle this new caravan, one of a handful in the past year. Officials from U.S. Customs and Border Protection, U.S. Border Patrol, the Guatemalan consulate in South Texas, the Mexican consulate in South Texas, Mexican government, Coahuila state government, and others met again Monday to talk about how to care for and process the group.





Homeland Security Secretary Kirstjen Nielsen on Tuesday said the U.S. is on guard against the latest wave of migrants trying to enter the U.S.

“Approximately 2,000 aliens have arrived in northern Mexico as part of a 'caravan' seeking to cross the border into Texas. Illegal entry will not be tolerated and we stand ready to prevent it. The Department of Homeland Security has been working with the Departments of State, Defense, and Justice to ensure all possible resources are available to address this lawless caravan," she said in a statement.

The Pentagon is in the process deploying 3,750 troops to the southern border as a continuation of a request made by the Department of Homeland Security in the fall. Defense officials have not clarified what specific tasks they will carry out or where they will be based.

The group originated in San Pedro Sula, Honduras, on Jan. 15.