“Do not come to the border. The border is closed,” she said in an audio message issued by the US Embassy in Mexico City.

“People who intend to travel to the US in an irregular fashion run the risk of becoming victims of crime and human smugglers,” Jacobson said.

The audio message was released after Jacobson and Juan Gonzalez, in charge of Latin American affairs at the National Security Council, held a meeting with Mexican Foreign Minister Marcelo Ebrard.

It comes as migrants, many from Central America fleeing economic crisis, crime and environmental devastation, are travelling through Mexico in growing numbers seeking to enter the US.

In the message, Jacobson warned that migrants who reach Mexico’s northern border endure “a dangerous trip”, and that the coyotes – human smugglers – whom they pay for help “are dangerous people”.

Furthermore, “in this moment of global pandemic, travelling and living in large groups or camps increases the risk of contracting and transmitting Covid-19… stay safe and await more information on the asylum process”, Jacobson said.

Data from US Customs and Border Protection indicates that 100,000 people were caught trying to illegally enter the country in February alone.

The growing crisis has even prompted President Joe Biden to tell the potential migrants: “Don’t come over… Don’t leave your town or city or community.”

Mexico has increased patrols on its southern border with Guatemala to stop undocumented Central Americans from heading to the US.

Since January it has identified 4,180 undocumented minors from Central American hoping to cross into the US.

Jacobson and Gonzalez are in Mexico with the goal of working with authorities there on developing a plan to manage the flow of migrants.