'Disaster of epic proportions': Migrant deaths on the rise; Border Patrol increases rescues

BUENOS AIRES NATIONAL WILDLIFE REFUGE, Ariz. – U.S. Border Patrol agent Jesus Vasavilbaso bounced his white SUV over dirt trails through remote terrain near the U.S.-Mexican border.  

Gray clouds offered some respite from the searing summer heat. Brown shrubs and cacti stretched to the horizon. His radio was quiet. For the moment. 

Vasavilbaso pulled over by a rescue tower and scoured the landscape looking for an increasingly common occurrence in this stretch of land: small groups of border crossers lost, disoriented and dehydrated in the desert sun.