( CNN ) -- Despite a report Tuesday of possible hazardous materials at a mail facility at Joint Base Anacostia-Bolling in the nation 's capital , no suspicious packages or letters were located , a Defense Intelligence Agency spokesman said . The agency 's mail-screening equipment alerted officials to the possible presence of a hazardous substance . Preliminary tests indicated it was a possible biotoxin , officials said earlier . But after an on-scene investigation , it was determined there was no threat , Lt. Col. Thomas F. Veale , an agency spokesman , said . The FBI has taken samples and will conduct further testing , he said . CNN 's Carol Cratty and Greg Seaby contributed to this report .
The FBI has taken samples from the mail facility at Joint Base Anacostia-Bolling . Authorities now say there was no suspicious package or letter . Mail screening equipment initially indicated there was a hazardous substance , an official says .