In a remote corner of the Nevada desert, a highly restricted area once used to test nuclear bombs, the U.S. government has been running a secret experiment called Project Bachus.
U.S. officials say they have built a small germ warfare factor to better understand how to detect similar operations in rogue nations or among domestic terrorists.
Technicians grew several pounds (kilos) of a harmless bacteria with characteristics similar to deadly anthrax.
This top secret project is that it shows that with the right technical knowledge it is easy to build and operate a small germ warfare factory. Even with the most sophisticated sensors such facilities are extremely difficult to detect.
The project was conducted in such extreme secrecy that some worry it might be seen as a violation of the international treaty that bans making germ weapons.