Fugitives part of German cell U.S. seeks three who Ashcroft says had 'extensive' ties to suicide hijackers behind Sept. 11 horror.
U.S. forces fired upon over Pakistan Pentagon uncertain about who shot at soldiers trying to retrieve helicopter wreckage in Pakistan.

Employers take precautions Companies try to protect letter handlers and office assistants who sort or open mail.
Potential anthrax therapy in works Researchers have identified receptor that allows anthrax toxins to enter cell.
Anthrax compared with foreign strains Investigators look at Iraqi, Soviet samples to see whether they match spores in letters.