interrupted to let him know a second plane had hit the World Trade Center in New York City.

According to the St. Petersburg Times, the president waited for the lesson to be completed and even took a few questions from the children.

Bush finally explained his seven minutes of silence during a 2011 interview.

"My first reaction was anger," he told the National Geographic Channel. "Who the hell would do that to America? Then I immediately focused on the children, and the contrast between the attack and the innocence of children."

"So I made the decision not to jump up immediately and leave the classroom. I didn’t want to rattle the kids. I wanted to project a sense of calm."