Hundreds of people from a Central American migrant caravan have united at the US-Mexico border, with some going as far as climbing the border wall, ahead of making formal asylum claims that could land them in detention centres.

The month-long caravan which gathered 1,500 immigrants from countries such as Honduras, Guatemala and El Salvador drew the wrath of US President Donald Trump, but were welcomed by Mexican towns along their journey.

The remaining 400 members are now faced with a difficult choice, whether to cross the border illegally into the United States, ask for asylum at the border, or try to remain in Mexico - where many of them face persecution.