'They said, keep going': migrants escorted back to Mexico without any explanation

In a chaotic situation at the southern border, agents are escorting migrants and expelling them from the US before they know what's happening

They couldn't work out quite where they were or where they were headed when the guards told them: Keep going".

They walked forward, as instructed, across an unfamiliar bridge and then suddenly they were in Mexico. Or, more accurately, back in Mexico. But 800 miles from where they had arrived in America.