People fleeing violence and poverty, most from countries of the Northern Triangle of Central America, but also from other parts of the world, are taking shelter in Matamoros, just across the border from Brownsville, Texas, in the U.S. Some 2,000 people—men, women and children—are living in tents by the international bridge. They receive few services and are largely reliant on volunteers from the US and Mexico that bring food, clean water and clothing.