Social post: Immigration continues to be a top concern for voters in the U.S. in this election year. The first installment of our latest series on immigration brings you the parallel lives of two dedicated officers, each patrolling a different side of the same river that marks the border between the United States and Mexico.

On the U.S. side, Deputy Sheriff Efrain Sanchez discussed the heightened level of security in Maverick County, Texas, and how he witnesses more people “running all over the place.” Meanwhile, on the other side of the border in Mexico Jose Francisco Contreras, Commander of Civil Protection and Firefighters, describes the tragedy of almost 50 people drowning in the Rio Grande river.

Nitza Soledad Perez reports from Piedras Negras, Mexico and Eagle Pass, Texas.