9/11 attacks
Twin towers are falling
Since the moment the towers were hit by planes they were both smoking heavily. Inside of them confused people started to evacuate down the stairs. South tower collapsed 56 minutes after the impact, the debris and dust covered the streets around the World Trade Center. The north tower collapsed half an hour later. As it later was discovered another building of the World Trade Center complex collapsed - called 7 World Trade Center.
The official explanation of the collapse of the towers is structural failure caused by the fire started from the impact and fuel that was in the planes. The number 7 building collapsed due to structural failure caused by fire inducted from debris of twin towers.
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