Just past 4 a.m., under a star-streaked sky, the Central American migrants shouldered their bags and picked over broken sidewalks, - first as a trickle, then as a flood - to the edge of the Mexican town.
They walked straight, without hesitation. Few spoke much. Their compass point was north, towards the United States.
Their goal for the day was Pijijiapan. The town, 30 miles away, was the next stop on a trek by thousands in a caravan that has so enraged U.S. President Donald Trump he has threatened to close the U.S.-Mexico border and slash aid to Central America.