One of the children from the car that crashed through President Bush's security; Photo - APYesterday, a car driven by a woman and three children broke through the security cordon outside the Mississippi arena where President Bush was speaking. One witness said after the car made it past the police barrier, police chased it, and the car jumped a curb, blowing two of its tires, and then crashed into the building: ""The whole thing just took seconds. I thought at once that this was an attack on the president." The driver was apprehended and detained, as were the children (apparently ages 8-10), one of whom looks understandably freaked out (pictured). A White House spokesperson said, "The president was never in any danger and is keeping his schedule."

The Times explains that there are three different perimeters set up during presidential visits: (1) An outer perimeter secured by the local and state police. (2) A middle perimeter, typically around the building where the event is taking place, is patrolled by a mix of Secret Service agents and police officers. Security checkpoints are here. (3) An inner perimeter inside the venue, patrolled by the Secret Service. Plus, the Secret Service is positioned around the event as well as counterassault teams.