NIST also did not find any evidence that missiles were fired at or hit the towers. Instead, photographs and videos from several angles clearly show that the collapse initiated at the fire and impact floors and that the collapse progressed from the initiating floors downward until the dust clouds obscured the view" and posted a FAQ about related issues on its website in August 2006.
The National Institute of Standards and Technology (NIST) found no evidence of missiles hitting or striking the towers. Instead, photographs and videos taken from various angles show that the collapses began on the fire and impact floors, and then progressed downward until dust clouds blocked the view. NIST posted a FAQ about related issues on its website in August 2006 to address public concerns.