Matamoros, Mexico, is a stronghold for various criminal organizations, particularly the Gulf Cartel. U.S. and Mexican officials say four U.S. citizens were abducted at gunpoint in the city on Friday. Alfredo Estrella/AFP via Getty Images hide caption
Migrant parents in the tent camps in Matamoros, Mexico, are sending their kids across the border and taking advantage of the rule that unaccompanied children can't be returned to Mexico. Here, Alexis Martinez holds a cellphone photo of his 7-year-old son Osiel. John Burnett/NPR hide caption
Drying migrants clothes in an encampment near the Gateway International Bridge in Matamoros, Tamaulipas. More than 1,500 asylum-seekers are living in the tent encampment. Veronica G. Cardenas for Texas Public Radio hide caption
William Linares, a 5-year-old from Honduras, plays in an encampment where he is living near the international bridge in Matamoros, Mexico, on April 30. The boy is traveling with his mother, Suanny Gomez, and seeking asylum in the United States. Eric Gay/AP hide caption