A BYU [Brigham Young University] professor has developed a new theory about the terrorist attack in New York on September 11, 2001. Both towers collapsed in place after the attacks, and later that day, 7 World Trade Center, which was never hit by a plane, fell in less than seven seconds. Professor Steven E. Jones says that planes alone did not bring down the towers. Jones is a 20-year physics professor at BYU, who's penned an academic paper raising another hypothesis - explosives may have been pre-positioned in the buildings. Notice how it's straight down," Jones says referring to the fall of one of the buildings. Especially intriguing to Jones was the destruction of 7 World Trade Center, damaged and ablaze from tower debris but never hit by a plane. "Symmetrically now, it doesn't topple over, as you might expect. It comes straight down. This is the goal of prepositioned explosives in a controlled demolition," says Jones. He wants a fresh new independent investigation.