AUSTIN, Texas (AP) — A U.S. Customs and Border Protection officer in southwest Texas has been arrested and charged with assaulting and abusing a minor in custody, the agency said Friday. .

The agent based in the Del Rio area along the border with Mexico was arrested Monday by the Texas Rangers, CBP said in a statement. A warrant was issued “following an indictment for official oppression”, the agency said.

The statement did not name the officer or describe the alleged assault, including where and when it occurred.

CBP’s Office of Professional Responsibility and the Texas Rangers — part of the Texas Department of Public Safety — are investigating allegations of assault and abuse of a minor in custody, he said.

A spokeswoman for the Texas Department of Public Safety declined to provide further details, citing the ongoing investigation. She directed The Associated Press to the Uvalde County District Attorney’s Office and U.S. Customs and Border Protection for information. Neither office responded to calls and written requests for additional details.

“CBP emphasizes honor and integrity in all aspects of our mission, and the overwhelming majority of CBP employees perform their duties with honor and distinction, working tirelessly every day to ensure the safety of our country,” CBP said in its statement.