Every day and night, Stephanie Quintana-Leguisano reads the letter her mother gave her before she disappeared Aug. 9 in Mexico.

Mexico’s official registry counts more than 120,000 disappeared people. The discovery of such places has accelerated ... But it was years before authorities did anything. When Tamaulipas Search Commissioner Jorge Macías visited for the first time ...

People crossing from Matamoros, Tamaulipas, into Brownsville, Texas, should expect more security and longer wait times at border bridges.