The number of migrants swelled overnight to approximately 5,000 as the mile-long caravan set out toward the Mexican town of Tapachula. Several hundred asylum seekers have reportedly applied for refugee status in Mexico, while an estimated 1,500 remain on the Guatemalan side of the Suchiate River in the hopes of entering Mexico legally. 

t was not immediately clear where the additional travelers had materialized from since about 2,000 had been gathered on the Mexican side Saturday night. They seemed likely to be people who had been waiting in the Guatemalan town of Tecun Uman and who decided to cross during the night.

They marched on through Mexico like a ragtag army of the poor, shouting triumphantly slogans like "Si se pudo!" or "Yes, we could!"

As they passed through Mexican villages on the outskirts of Ciudad Hidalgo, they drew applause, cheers and donations of food and clothing from Mexicans.