Are we witnessing the beginning of a cyber arms race? Seems like it. The Stuxnet computer virus is taking worries about cyber warfare to a new level. It’s the first reported case of malicious software designed to sabotage industrial controls. Experts say it is a prototype of a cyber-weapon that will lead to a new global arms race. Computers will be the weapons. The program specifically targets control systems built by Siemens AG, a German equipment maker. Iran, the target of U.N. sanctions over its nuclear program, has been hit hardest of any country.