The first tower of WTC fell from the terrorist attack has given a great impact to the surrounding building. From the great impact has weakened the building structure especially of building 7. BBC has made live broadcasting news when the building 7 is still standing behind her head after the first collapse has been confirm on building 7. Since the evacuation process has been done there is injury has been reported from the collapse but counting the amount of death from the WTC fell in unbelievable. Building 7 is then collapse completely after 20 it fell. This tragedy event has killed unbelievable number of people and destroying the world most busy place in trading when they are many workers and tourist on the building.