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 Department of Justice filed a criminal complaint on Monday against 10 people who allegedly "organized an ambush" at an ICE detention center in Texas on the Fourth of July.