Some in the caravan – which is mostly people from Honduras – broke through a border crossing with Guatemala on Friday where they were met with a wall of Mexican and Guatemalan law enforcement officers who unleashed pepper spray, forcing the migrants to retreat onto the bridge.

On Saturday, organizers of the caravan were moving people about 30 feet back from the border gate to avoid another rush on the crossing and to establish a buffer zone with security officers.

The migrants vowed to press forward.

Jose Yanez, a 25-year-old farmer who said he made about $6 a day, woke early with a backache after a chilly night on the bridge. “From here, we’re going on. From here, there’s no turning back,” he said.