“It’s lit up by the tower lights – it just looks like smoke”
The cloud was caused by a steam release as part of routine maintenance, according to insiders.
A construction official on the scene told a local newspaper: “It’s lit up by the tower lights.
“It happens with fog and even clouds. It just looks like smoke.”
The memorial was built to mark the passengers and crew who stopped a fourth plane hijacked by warped terrorists reaching its target.