ALVARADO, Texas (AP) — Ten people have been arrested on attempted murder charges in connection with a shooting outside of a Texas immigration detention center that wounded a police officer, where people in black military-style clothing fired at authorities in a “planned ambush,” a U.S. attorney said.

A U.S. attorney called the wounding of a police officer an ‘ambush’ and warned of increasing violence against immigration agents.

The 10 people arrested in connection with the shooting of a Texas police officer were part of a planned ambush on a detention center used to house U.S. Immigration and