EL PASO, Texas (Border Report) — A National Guard soldier reportedly shot a migrant who was seen stabbing another migrant on the U.S.-Mexico border, according to an internal Border Patrol bulletin obtained by NewsNation.

The incident happened on U.S. soil along the edge of the Rio Grande on Sunday afternoon in El Paso’s Lower Valley.

In a statement to Border Report, a Texas Military Department spokesman confirmed that a National Guard servicemember assigned to Operation Lone Star discharged a weapon in a “border-related incident” on Sunday, adding that it is under investigation and that more information will be made available as the investigation progresses.

NewsNation correspondent Ali Bradley reported Monday that the incident involved a member of the Indiana National Guard sent to help Texas at the border.

According to the U.S. Border Patrol bulletin, titled “Border Violence/National Guardsman Involved in a Shooting,” the soldier saw an individual stabbing a migrant on the U.S. side of the river, which is mostly dry in El Paso. The soldier shot the attacker, who ran back into Mexico. It is unclear what they were shot with or whether they were struck.

Investigators soon determined that two individuals had been wounded. An El Paso Fire and Rescue crew responded and treated the migrants for what were described as “superficial wounds” not considered life-threatening.

The bulletin says the Texas Department of Public Safety sealed off the area and that no U.S. Border Patrol agent had been allowed in the secured area or allowed to speak with the individuals involved. However, one agent did escort the medics who took one of the migrants to a hospital, and border agents were to help identify and process the migrants.

Border Patrol officials referred all questions to the Texas Department of Public Safety and the Texas Military Department, of which the Texas Army National Guard is part.

Border Report has also reached out to Texas DPS and is awaiting a response.

Juarez police officials said they had not heard anything about a shooting on the border.