Thousands of migrants from Central America left southern Mexico on 20 November, aiming to reach the US before President-elect Donald Trump takes office in January.
The group hopes to avoid potential immigration controls and continue using the CBP-ONE asylum system to enter the country.
Trump has promised mass deportations when he takes office.
The migrants seek permission for free movement across Mexico to reach the US border. Past caravans have often dispersed along the way.
Source: BBC World
