The administration said 57 children under 5 years old were reunified as of Thursday morning. But 46 kids weren't reunited because of safety concerns.

11 families who had been detained and separated returned home Tuesday to Guatemala aboard a U.S. government-chartered flight.

An immigration virtual reality simulation developed by Academy Award-winning director Alejandro Inarritu lets visitors 'cross the border.' For children of immigrants, the experience hits close to home.