The Israeli agents were first seen filming the attack on the WTC while kneeling on the roof of a white van in the parking lot of a New Jersey apartment building across the river from lower Manhattan.

"They seemed to be taking a movie," the resident who noticed them said. The men were taking video or photos of themselves with the World Trade Center burning in the background, she said. What struck her were the expressions on the men's faces. "They were like happy, you know … They didn't look shocked to me. I thought it was very strange," she said.

She found the behavior so suspicious that she wrote down the license plate number of the van and called the police. The FBI was soon on the scene and a statewide bulletin was issued on the van.

And nobody asked them, how they knew that in advance?