A group of more than 4,000 Central American migrants heading for the United States has arrived in southern Mexico.
The so-called caravan is not the only one of its kind in the country. At least two smaller groups are following behind.
Mexican authorities are under pressure from the US to make them stay in Mexico, offering shelter and a temporary work programme, instead of pressing on.
But many refuse, afraid the aim is to send them back.
Al Jazeera’s John Holman reports from Tapachula, Mexico on the Guatemala border.