Ten years after the first attack on the World Trade Center, experts are questioning why lessons from the bombing were not learned.

Six people, including accused ringleader Ramzi Yousef, were convicted in the bombing, which left a 150-foot-wide crater inside the Trade Center’s parking garage.

Six people, including accused ringleader Ramzi Yousef, were convicted in the bombing, which left a 150-foot-wide (45-meter-wide) crater inside the Trade Center’s parking garage.

Six people, including accused ringleader Ramzi Yousef, were convicted in the bombing, which left a 150-foot-wide (45-meter-wide) crater inside the Trade Center’s parking garage.