At least 1,300 people have entered Guatemala in a new U.S.-bound caravan from Honduras, authorities said on Thursday, putting pressure on the region to satisfy Trump administration demands to contain northbound illegal immigration.

Mexico's government is bracing for the arrival of hundreds of Central Americans on its southern border in coming days, an event likely to be closely monitored by the U.S. government, which has made curbing illegal immigration a priority.

Arriving in Guatemala chiefly via crossings on its northern border with Honduras, around 1,350 migrants had been registered entering legally by late morning, said Alejandra Mena, a spokeswoman for Guatemala's National Migration Institute.