That's when I heard about the second plane. That eliminated any thought of coincidence -- it was hijacked planes and a terrorist attack.
I got to work and heard that another plane had crashed into a helicoper pad at the Pentagon. A car bomb had gone off outside the State Department's building. A third plane crashed 80 miles out of PA. Not long after that, I heard that both of the towers had collapsed under the fire, stress and damage from the impacts.
How many thousands of people dead? Nobody can know. It may take months for them to sort it out.
This isn't terrorism. It's an act of fucking war.