U.S. Border Patrol agents shot a woman in Chicago Saturday after an angry mob apparently tried to attack the law enforcement officers. The gunfire erupted after a group of agents were “rammed in by 10 cars” and “boxed in” while patrolling the city’s South Side, Department of Homeland Security spokeswoman Tricia McLaughlin told the Chicago Sun-Times. The agents fired “defensive shots,” then discovered the woman, who was driving in a vehicle, “was armed with a semi-automatic weapon,” McLaughlin told the outlet.