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ARI SHAPIRO, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

ARI SHAPIRO, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

ARI SHAPIRO, HOST:

In June 2010, 15-year-old Sergio Hernandez and his friends were playing chicken at the U.S.-Mexico border, daring each other to run up and touch the tall border fence separating Juarez, Mexico, from El Paso, Texas.

At some point during their game, U.S. border patrol agent Jesus Mesa arrived on a bicycle. He detained one of the kids on the U.S. side while the others ran away. Hernandez hid behind a pillar beneath a bridge on the Mexican side of the border. A cellphone video shows the boy peeking out from behind the column, before Mesa shoots and kills him.

Updated at 4:35 p.m. ET

President Trump has announced that Army Lt. Gen. H.R. McMaster will be his new national security adviser. McMaster will replace retired Army Lt. Gen. Michael Flynn, who was forced to resign after revelations that he had misled top White House officials about his conversations with the Russian ambassador to the U.S.

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