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FILE - The Prairieland Detention Center is seen, Sept. 15, 2016, in Alvarado, Texas. (Louis DeLuca/The Dallas Morning News via AP, File)

Ten people have been arrested on attempted murder charges after attackers in black military-style clothing opened fire outside a Texas immigration detention center in a “planned ambush†that left one police officer wounded, a prosecutor said.

The officer was shot in the neck on Friday, the night of the , after reporting to the Prairieland Detention Center in Alvarado, about 40 miles (65 kilometers) southwest of Dallas. He was treated at a hospital and released, the Johnson County Sheriff's office said.

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