Detained in the desert: migrants stuck in camps in the extreme climate of the US-Mexico border

At the US-Mexico border site, called open-air detention centers by some, migrants face harsh weather in makeshift tents

It's 8am on a chilly fall morning when the U-Haul pulls up at the US-Mexico border wall in Jacumba Hot Springs, California.

Dozens of people emerge from makeshift tents and from around small bonfires to welcome it, and line up for some of the water bottles and peanut butter jelly sandwiches its volunteers are carrying.