<P> 1: 27: Mayor Anthony A. Williams of Washington, D.C., declares a state of emergency; the District of Columbia National Guard arrives on site . </P> <P> 2: 39: At a press conference New York Mayor Rudy Giuliani is asked to estimate the number of casualties at the World Trade Center . He replies, "More than any of us can bear ." </P> <P> 2: 50: President Bush arrives at Offutt Air Force Base, Bellevue, Nebraska, to convene a National Security Council teleconference via the U.S. STRATCOM bunker . </P> <P> 3: 00 (approx .): Pasquale Buzzelli, who lost consciousness in a North Tower stairway during the collapse, awakens to find himself lying atop the debris with only a fractured foot . </P>

How many minutes between the twin towers being hit