President Trump says he's 'bringing out the military' at border

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The migrants still have some 3,000 kilometers left to walk to reach the US.

The journey poses a host of dangers, such as dehydration and criminal gangs, but numerous migrants say they feel safer travelling in numbers. "That has spurred a new caravan, but this caravan is much larger".

Still, the size of the caravan - estimated by the United Nations at more than 7,000 strong - seemed basically undiminished as the throng set out in darkness cut by occasional flashlights or the spotlights of municipal police who were escorting them.

Espinosa said there is no work in Honduras and "that's why we chose to come here, to give a better future for our children". If that's what they want, they should say it.

Honduras, which has a population of about nine million, has endemic problems with gang violence, drug wars and corruption.

Honduras' homicide rate is about 43 per 100,000 inhabitants, among the world's highest for a country not at war. "There's no food. We've only eaten because Guatemalans have been good to us", said a man named Samuel, who only gave his first name for fear of retribution at home. As journalists write about why people are on the move, they shed light on Central America's many troubles.

CNN reporters following the caravan say they haven't met anyone from the Middle East, and have encountered many people who are fleeing gang violence. "Any other means that don't involve respecting the law will make it very hard for those marching with this caravan to reach their objective".

Other media outlets, such as The Wall Street Journal, confirm that People Without Borders, a U.S. -Mexico organization that has supported migrant caravans in the past, is at least one group that is leading the current caravan. They remain over 1,000 miles from the United States.

Children appear to make up only about 5 to 10 percent of migrants in a caravan traveling through far-southern Mexico. But as a scholar of forced migration, I believe it's also important to consider why migrants travel in groups: their own safety.

Trump and his fellow Republicans have sought to make the caravan and immigration major issues ahead of the November 6 US congressional elections in which the party is trying to maintain control of the House of Representatives and the Senate.

Several people were injured and a number of children were separated from their parents in the ensuing melee. Mexican officials have been sending buses and offering to transport them, but migrants have been hesitant to board - anxious they'll end up trapped in government custody, unable to continue their journeys to the U.S. border.

"They suffered, we know this is the route of death, where a lot of people have died". She described the threats and pressure they would be likely to face back home once they're older.

Unlike previous smaller convoys of migrants, this one has drawn the attention of US President Donald Trump.

US Customs and Border Protection meanwhile said it had apprehended a record 16,658 people who arrived in the country illegally in families last month, up 900 from August and almost 12,000 from September 2017.

Trump also said he has started to stop or substantially reduce aid to Guatemala, Honduras, and El Salvador, where most of the Central American migrants are coming from, because the countries failed to stop the illegal immigrant flow.

Trump has been stoking fears about the caravan and illegal immigration to rally his Republican base ahead of the hotly contested November 6 midterm elections, repeatedly hitting Democrats on the issue.