25 Years Later, New 9/11 Accusations

On September 11, 2001, a generation of Americans watched the twin towers fall. Twenty-five years later, a new generation is learning about that day in classrooms, while the families of victims say they have uncovered evidence that could reshape the country's understanding of who was really responsible.

At George Mason University, Professor Meredith Luer teaches a class on the history of 9/11 to students who were not yet born when it happened. "It seemed like there was a kind of intensifying forgetting and also a glibness around the conversation around 9/11," she said. Her class pairs these students with those who have living memory of the attacks, trying to bridge a gap that feels increasingly wide. One student born after 2001 described the unity she imagines existed that day; an older classmate replied, "Well, think of what it's like right now. It's just the opposite."

But even as memory fades, new facts are emerging. ABC's Chief Investigative Correspondent Aaron Katersky reports that families of 9/11 victims have been pursuing a lawsuit for years, believing the nineteen hijackers could not have pulled off the plot alone. "The nagging question has always been who funded them?" Katersky said. "The belief has been that only a state, a government, would have the significant resources needed to pull off the spectacular plot."