The caravan of migrants making its way through Mexico to the US became a major talking point for candidates and their stumpers during the US midterm campaigns.
Thousands of Central Americans streamed into Mexico's capital on the eve of the US midterm elections. While the migrant caravan is theoretically a step closer to their goal of seeking asylum in the US, the closest border is still more than 900 kilometres away.
Here's what you need to know about the migrant caravan:
It’s not just one caravan
A group of people in San Pedro Sula, Honduras, started out for the United States on October 13. Over time, people from Guatemala, El Salvador and some from Nicaragua have joined the caravan, which has become a collective of caravans, each at a different pace, moving north.
The first Central American migrants from one of the caravans reached Mexico City on Sunday.
How many people?
Mexico's Interior Minister Alfonso Navarrete puts the size of the lead caravan at 2,800 to 3,000, below the government's previous estimate of about 3,500.
Participants in the caravan have put the number significantly higher.
Authorities counted more than 2,000 migrants entering the Jesus Martinez stadium by mid afternoon on Monday, and a steady flow continued into the night.
Nashieli Ramirez, ombudsman for the local human rights commission, said the city was preparing to accommodate as many as 5,000 people.
The lead caravan is estimated to have about 4,000 participants and several smaller groups are trailing hundreds of miles to the south.
Most previous caravans only carried a few hundred people.
In search of the American Dream
In dozens of interviews since the initial caravan set out from Honduras, more than three weeks ago, migrants have said they are escaping rampant poverty and violence.
Many are families travelling with small children. Some say they left because they were threatened by gang members or had lost relatives to gang violence.
Others say they hope to work, secure a good education for their children and send money to support loved ones back home.
Why travel in a big noticeable group?
Many in the latest group said they remain convinced that travelling together is their best hope for reaching the US.
But Edgar Corzo, an official with the National Human Rights Commission, said that based on experiences with previous migrant caravans, the group probably will begin to break up now that it is in the capital.
"Each one goes to the place that he considers best," mainly wherever is closest to where they have relatives or friends already in the United States, he said.
Pitstop — Jesus Martinez stadium
The facility has a capacity to hold 6,000, officials said, and four big tents set up for sleeping have filled up.
Early arrivals eagerly sifted through donated clothes, gave themselves sponge baths and ate chicken and rice. They then picked up thin mattresses to hunker down for the night.
What are their health problems?
Many of the migrants sought treatment for blistered and aching feet, illness, dehydration and other ailments.
"Since we got here, we have not stopped," said Tania Escobar, a nurse with Mexico City's public health department, working at the treatment tent.
More migrants were trudging along the highway between the city of Puebla and the capital, trying to hitch rides from passing vehicles.
The Trump reaction
US President Donald Trump has made the migrant caravan a central issue ahead of the key US midterm elections.
He seized on the caravan and portrayed it as a major threat, even though such caravans are not new and previously largely went by unnoticed.
He ordered thousands of troops to the US-Mexico border when the migrants were still hundreds of miles to the south, threatened to detain asylum seekers in tent cities and has insinuated, without proof, that there are criminals or even terrorists in the group.
"That's an invasion. I don't care what they say," Trump said on Monday, referring to the thousands of migrants marching toward the border.
He suggested any rock throwing by migrants should be treated as equivalent to gunfire.
He has also threatened to slash US aid to Central America and close the US border with Mexico.
The caravan had spread out in recent days, with some participants advancing at a faster pace.
Many said the caravan would now regroup in Mexico City.
Oscar Ulloa, 20, an accountant from Honduras who was able to travel to the capital by bus from Puebla thanks to handouts from Mexicans, said he expected the group to vote in the coming days on its next moves.
What if they enter the US?
The Immigration and Nationality Act says any immigrant in the United States can apply for asylum, whether or not the immigrant entered the country through a designated port of entry.