Tuxtla Gutiérrez - A group of around 350 Central American migrants "broke violently" into Mexico Friday, the country's immigration authorities said, as a new caravan of around 2 500 people arrived from Guatemala.

Mexico's National Migration Institute said some members of the caravan had attacked local police in the southern town of Metapa de Dominguez -- news sure to draw the attention of President Donald Trump as he continues his crackdown on undocumented migrants heading toward the US.

"Today at 3:30 am (0830 GMT) a group of approximately 350 people broke violently across the Mexican border from Guatemala," the National Migration Institute said in a statement.

"With an aggressive attitude, (the migrants) broke the padlock on the border gate and entered the country."

The caravan set out Wednesday from the city of San Pedro Sula in Honduras and has picked up Guatemalans and some Nicaraguans along the way.