 The NIST report found no evidence supporting conspiracy theories that 7 World Trade Center was brought down by controlled demolition . Specifically , the window breakage pattern and blast sounds that would have resulted from the use of explosives were not observed . The suggestion that an incendiary material such as thermite was used instead of explosives was considered unlikely by NIST because of observations of the fire and the building 's structural response to the fire , and because it is unlikely the necessary quantity of material could have been planted without discovery . 
