Response to Terror

Bioterrorism: The mail handler had no known link to tainted areas. 15,000 in U.S. are advised to take antibiotics.

The Postal Service will install special equipment at 250 to 300 mail processing centers throughout the country during the next 15 to 18 months to irradiate mail and kill anthrax spores and other dangerous bacteria, a top official said Thursday.

Investigation: A lack of facts hinders the homeland security director’s public mission of trying to reassure an anxious nation.

Bioterrorism: It’s trial and errors as government agencies take on a brave new world--and the media spotlight.

Probe: Government official says finding any details that might help identify how the mailed anthrax was concocted is a “chemist’s nightmare.”