Each Tower Disappeared into a Volcano-like Cloud of Dust
The dense dust clouds that replaced the towers
resembled pyroclastic flows studied by vulcanologists.
- The dust clouds rapidly expanded to many times each tower's volume.
- The dust clouds advanced down streets at around 30 mph.
- The clouds were dense enough to pick up and carry people.
New York Daily News photographer David Handschuh recalled:
I got down to the end of the block and turned the corner when a wave--
a hot, solid, black wave of heat threw me down the block.
It literally picked me up off my feet and I wound up about a block away.