An off-duty Customs and Border Protection agent from an elite tactical unit is the hero who shot and killed the Robb Elementary School gunman before he could continue his massacre, reports said Wednesday. The agent, a member of CBP’s Border Patrol Tactical Unit (BORTAC), rushed into the school while the shooter was still active and began exchanging rounds with the gunman, who was barricaded inside a fourth-grade classroom, NBC and Fox reported. The officer was injured during the shooting but he managed to “eliminate the threat” and kill the shooter before he could commit more carnage, law enforcement sources told NBC. The agent, part of CBP’s Del Rio sector, which covers Uvalde, was trained in a manner similar to US special forces. BORTAC agents are taught to handle terror threats abroad and other chaos, such as riots at ICE detention facilities, NBC reported.