Ellen Nakashima Aaron Gregg The Washington Post

The cyber threat hunters had honed their chops at the National Security Agency - the world's premier electronic spy agency. And last fall, they were analyzing malware samples from around the world when they stumbled across something highly troubling: the first known piece of computer software designed to kill humans.

The cyber threat hunters had honed their chops at the National Security Agency - the world's premier electronic spy agency. And last fall, they were analyzing malware samples from around the world when they stumbled across something highly troubling: the first known piece of computer software designed to kill humans.