Anthrax found at US Federal Reserve headquarters

Officials in the US have discovered a bag of mail contaminated with anthrax at the headquarters of the Federal Reserve in Washington.

Officials said the bag contained 100 to 150 letters, but they have not determined if one of those letters contained anthrax or if the bag was contaminated by other letters.

Five people have already died since somebody began sending anthrax to politicians and broadcasters in the US.