DHS chief Mayorkas sidelines agents during investigation into images of rough treatment of migrants

Border Patrol agents who were involved in a rough encounter with migrants this week in Texas have been sidelined from law enforcement duties during an investigation into their behavior, Homeland Security Secretary Alejandro Mayorkas told lawmakers on Wednesday.

The images of agents on horseback seemingly berating and lashing their reins on migrants who breached the border have drawn a feverish reaction from Democrats, who demanded discipline.

Mr. Mayorkas told the House Homeland Security Committee he shared their outrage and vowed to “pull no punches” in punishing anyone found to have...