 Files relating to numerous federal investigations had been housed in 7 World Trade Center . The Equal Employment Opportunity Commission estimated over 10 @,@ 000 of its cases were affected . Investigative files in the Secret Service 's largest field office were lost , with one Secret Service agent saying , " All the evidence that we stored at 7 World Trade , in all our cases , went down with the building . " Copies of emails in connection with the WorldCom scandal that were later requested by the SEC from Salomon Brothers , a subsidiary of Citigroup housed in the building , were also destroyed . 
