KEY forensic evidence in the US anthrax attacks of 2001 has been revealed. The FBI had previously prevented the scientists involved from speaking publicly about their findings in case this interfered with court proceedings, but last August, after chief suspect Bruce Ivins committed suicide, the case collapsed and the FBI lifted many of the restrictions. This week, some of the scientists involved revealed their results at a scientific meeting in Baltimore, Maryland.
These show how the FBI traced the spores used in the attacks to a single flask at a US government lab, but they don't explain why the FBI made Ivins - who worked at the US Army Medical Research Institute for Infectious Diseases (USAMRIID) - the chief suspect.
See also: The hidden anthrax letters suspect