A National Guard soldier fired at a migrant who stabbed two individuals at the Texas-Mexico border, according to a document obtained by NewsNation.

The incident occurred on Sunday afternoon along the Rio Grande River in El Paso’s Lower Valley, NewsNation reported. A member of the Indiana National Guard — deployed to the area as part of Republican Texas Gov. Greg Abbott’s Operation Lone Star – witnessed an individual stab a fellow migrant and fired their weapon in response, according to the outlet.

The stabbing reportedly took place on the U.S. side of the river.

“Early on the afternoon of 14 April, a National Guard service member assigned to Operation Lone Star discharged a weapon in a border-related incident. The incident is under investigation,” the Texas Military Department said in a statement to the Daily Caller News Foundation on Monday.

The individual crossed back onto the Mexican side of the border after being shot at, NewsNation reported. The document did not make clear if the attacker was struck by the shot.

Investigators later determined that two individuals were stabbed during the incident, according to NewsNation. A local fire and rescue crew responded shortly after and treated both migrants for “superficial wounds” that were not deemed to be life-threatening.

“More information will be made available as the investigation progresses,” the Texas Military Department continued in their statement.

The Texas Department of Public Safety did not immediately respond to the DCNF’s request for comment.