Saudi Arabia's leader on Tuesday downplayed the kingdom's role in the 9/11 attacks. But an ongoing federal court case is revealing new details about Saudi officials' alleged ties to the terror plot " and the potential liability that government faces. The lawsuit unearthed evidence showing one Saudi official " who acknowledges aiding two men who became hijackers " made a drawing of a plane and a mathematical formula that allegedly could have been used to fly into the World Trade Center.