 Furthermore, any explosives would have to withstand the impact of the airliners.Members of the group "Scholars for 9/11 Truth" have collected eyewitness accounts of flashes and loud explosions immediately before the fall.Eyewitnesses have repeatedly reported of explosions happening before the collapse of the WTC towers, and the organization "International Center for 9/11 Studies" has published videos obtained from NIST, together with indications about when such explosions could be heard.