About 3,000 migrants from Central America, Venezuela, Cuba and Haiti on Wednesday blocked traffic on one of Mexico’s main southern highways to demand transit or exit visas to reach the US border.

The caravan of migrants set out on foot from the city of Tapachula, near the Guatemalan border, on October 30, walking north toward the US. The contingent—including many women and children—later stopped walking at Huixtla, another town in the southern state of Chiapas, where they tried to get temporary travel documents to cross Mexico.