Scenes of the caravan as Honduran migrants push north

Thousands of migrants from Honduras slowly push north as they attempt to cross into Mexico via Guatemala, en route to the U.S. border. The migrant caravan is increasingly becoming a humanitarian crisis as the migrants battle heat, exhaustion and a dangerous passage.

The Mexican government has closed its southern borders indefinitely. President Donald Trump has threatened to close the U.S.-Mexico border if the migrant caravan continues north.

But the migrants vow to keep pushing through, finding alternative routes north. The following are some of the harrowing scenes developing around the border between Guatemala and Mexico.

Pictured above: Aerial view of a Honduran migrant caravan heading to the U.S., as it is stopped at a border barrier on the Guatemala-Mexico international bridge in Ciudad Hidalgo, Chiapas state, Mexico, on Oct. 19.

Central American migrants, part of a caravan trying to reach the U.S., wade across the Suchiate River to avoid the border checkpoint in Ciudad Hidalgo, Mexico, on Oct. 20.

A Mexican riot policeman shields an immigrant mother and child from flying rocks during a clash between police and the migrant caravan on the border between Ciudad Hidalgo, Mexico, and Ciudad Tecun Uman, Guatemala, on Oct. 19. A faceoff occurred when the caravan of thousands of migrants tried to enter Mexico after pushing past Guatemalan security forces. The caravan pried open the gate into Mexico but were pushed back by Mexican riot police. Some immigrants threw stones at police, who then fired tear gas into the crowd.

A Honduran migrant protects his child after fellow migrants stormed a border checkpoint in Ciudad Hidalgo, Mexico, on Oct.19.

A Honduran migrant boy carries a bag as he takes part in a caravan heading to the U.S. on the road linking Ciudad Hidalgo and Tapachula, Chiapas state, Mexico, on Oct. 21.

A child who is part of the Honduran migrant caravan headed to the U.S. stands next to tents at the International Mesoamerican Fair's venue in Tapachula, Chiapas state, Mexico, on Oct. 22.

Honduran migrants climb on a bus during a new leg of their travel, in Guatemala City, Guatemala, Oct. 18.

Honduran migrants heading in a caravan to the U.S. hold a crying baby while they struggle to cross one of the gates of the Guatemala-Mexico border bridge in Ciudad Hidalgo, Chiapas state, Mexico, on Oct. 19.

Honduran migrants aboard a truck in Metapa on their way to Tapachula, Chiapas state, Mexico, on Oct. 22.

Honduran migrants stand in front of Honduran police blocking access to the Agua Caliente border with Guatemala as they try to join a migrant caravan heading to the U.S., in the municipality of Ocotepeque, Honduras, Oct. 19.

A man points at a map amid a caravan of thousands of migrants from Central America as they walk towards Tapachula from Ciudad Hidalgo while en route to the United States, in Frontera Hidalgo, Mexico, Oct. 21.

Migrants bound for the U.S.-Mexico border wait on a bridge that stretches over the Suchiate River, connecting Guatemala and Mexico, in Tecun Uman, Guatemala, Oct. 19. The gated entry into Mexico via the bridge has been closed.

Honduran migrants cross the Suchiate River, a natural border between Guatemala and Mexico, in makeshift rafts, in Ciudad Tecun Uman, Guatemala, on Oct. 21.

A paramedic checks the blood pressure of a migrant taking part in a caravan heading to the U.S., at the main square in Tapachula, Chiapas state, Mexico, on Oct. 21.

A Central American migrant is pictured after crossing the Suchiate River to avoid the border checkpoint in Ciudad Hidalgo, Mexico, Oct. 20.