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On Saturday, Mexican immigration authorities only allowed some 640 migrants through the official border crossing on a bridge spanning the Suchiate River. People are seen marching Sunday
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The migrants pose a challenge to Mexican President Enrique Pena Nieto's promise late last week to stop the travelers' plans to press ahead to the U.S. border without the proper documents
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Many of the bedraggled travelers of the swollen caravan appeared determined to keep moving, saying they are fleeing a toxic mix of violence, poverty and endemic corruption and would not turn back
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Their numbers swelled from 2,000 to about 5,000 overnight and at first light they set out walking toward the Mexican town of Tapachula, 10 abreast in a line stretching approximately a mile. That number has now increased to around 7,000
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Honduran migrants wait to cross the border from Ciudad Tecun Uman, Guatemala, to Ciudad Hidalgo, Mexico on Sunday
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A police officer looks on as Central American migrants walk along the highway near the border with Guatemala, while they continue their journey trying to reach the U.S.
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Parents carrying their children were among the migrants taking part in the caravan on Sunday as they cross the border from Tecun Uman, Guatemala, to Ciudad Hidalgo, Mexico
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A Honduran migrant heading in a caravan to the US, carries a baby on the road linking Ciudad Hidalgo and Tapachula, Chiapas state, Mexico
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A baby taking part in a migrant caravan heading to the US, rests on the road linking Ciudad Hidalgo and Tapachula, Chiapas state, Mexico, on Sunday
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The slow pace of legal processing prompting several thousands to cross the river illegally by raft or swimming, according to local officials and migrant organizers
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Encamped for two nights using backpacks for pillows and tents made of trash bags on a long bridge between Guatemala and Mexico, the migrant caravan began in San Pedro Sula, Honduras, last week and grew exponentially as it passed through Guatemala. The migrants are seen above on Sunday
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The gateway to the border with Mexico is locked while hundreds of Honduran migrants are still waiting on the bridge between Tecun Uman, Guatemala, and Mexico on Sunday
