Andrew Weber, U.S. Pentagon expert, carries a part of equipment at the former Soviet bio weapons facility in northen Kazakhstan's town of Stepnogorsk in this July 25, 2000 file photo. Biowarfare was once the Soviet Union's deadliest secret but governments fear the once closely-guarded knowlege has spread, possibly allowing terrorists to mount attacks against which the world would be totally defenseless. 

Andrew Weber, U.S. Pentagon expert, carries a part of equipment at the former Soviet bio weapons facility in northen Kazakhstan's town of Stepnogorsk in this July 25, 2000 file photo. Biowarfare was once the Soviet Union's deadliest secret but governments fear the once closely-guarded knowlege has spread, possibly allowing terrorists to mount attacks against which the world would be totally defenseless.

GD/JRE 

Andrew Weber, U.S. Pentagon expert, carries a part of equipment at the former Soviet bio weapons facility in northen Kazakhstan's town of Stepnogorsk in this July 25, 2000 file photo. Biowarfare was once the Soviet Union's deadliest secret but governments fear the once closely-guarded knowlege has spread, possibly allowing terrorists to mount attacks against which the world would be totally defenseless.

SZH/