Search and rescue efforts are deployed as a result of unexpected dangers during illegal border crossing attempts.

During her visit, Mexico Foreign Secretary Alicia Barcena Ibarra discussed how the U.S. and Mexico can work together to improve migration mechanisms.

Busloads of people arrived at San Antonio's Migrant Resource Center from the border, with many of them waiting for days for their next phase of the journey.

(CNN) -- A tip from an anonymous caller led police in Laredo, Texas, to a surprising discovery: 36 migrants trapped in a hidden compartment inside a dump truck that appeared to be hauling gravel. Later that morning, they received a call reporting that people were concealed in a compartment inside the vehicle. Investigators found that plywood sheets had been installed inside the truck, creating the hidden compartment. The migrants who'd been trapped in the truck are now in the custody of federal immigration authorities, police said. In the past, CBP has released reports of large groups of migrants trapped inside trucks and warned that smugglers are placing migrants' lives in danger.