Protesters set off fireworks. They spray-painted epithets on vehicles parked outside the ICE facility. And someone opened fire on a police officer dispatched to the scene, wounding him in the neck.

Is this becoming the new normal?

Authorities say they found shell casings and two assault-style rifles after shooters fired 20 to 30 rounds at the Prairieland detention center in Alvarado earlier this month. Days later , a Michigan man opened fire with an assault rifle and wounded three people, including a police officer, at a Border Patrol station in McAllen. Border Patrol agents shot and killed the gunman, 27-year-old Ryan Louis Mosqueda.

Jon Lewis, a research fellow at the program on extremism at George Washington University, said political violence, including attacks on elected offici

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