A U.S. Border Patrol agent based in South Texas was involved in a shooting near the Rio Grande on Sunday morning after he was assaulted, according to U.S. Customs and Border Protection.

The federal agent had been attempting to arrest a person near the U.S.-Mexico border in Eagle Pass, Texas, shortly before 10 a.m. local time when the individual “assaulted” the agent, the Department of Homeland Security agency said in a statement Sunday. It’s not clear how the person hurt the agent or what injuries he sustained.