Tempers among trekkers flare as they struggle with exhaustion, blisters, sickness and swollen feet after Veracruz Governor reneges on an offer to provide buses to leapfrog the migrants to the Mexican capital.
Mexico now faces unprecedented situation of having three caravans stretched out over 500kms of highways in the southern states of Chiapas and Oaxaca, with a total of about 6,000 migrants.
US President Donald Trump has said the migrants would not be allowed into the United States, calling the caravans "a disgrace to the Democrat party."
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