A potent chemical is being pumped into a building that used to house a supermarket tabloid -- before it became the scene of a deadly anthrax attack.

A photo editor died after someone mailed anthrax to the Sun in October 2001. The building in Boca Raton, Fla., has been closed since.

After the cleanup, it will house BioONE, a crisis management venture established by former New York Mayor Rudolph Giuliani (search) and a company that decontaminated other buildings hit by anthrax attacks.

Giuliani says the building will be a symbol that America can "deal with these new risks that have developed in our new world." Giuliani was mayor when New York's World Trade Center (search) was destroyed by terrorists a month before the anthrax attacks started.

After a call of "Let's go" from Giuliani, workers started the flow of chlorine dioxide into the building to kill the spores.