Robert Ludlum's The Lazarus vendetta

The Lazarus Movement, the dominant force in the eco-conscious, "anti-technology" protest movement, has sent rumblings down the halls of the world's intelligence agencies. Led by a mysterious, never-seen figure known only as Lazarus, this increasingly prominent group is believed by some to be preparing a bold strike. When an attack on a nano-technology research facility leaves thousands dead, protesters and scientists alike, from what appears to be a cloud of inadvertently released but gruesomely deadly nanobots, pandemonium reigns. Lt. Col. Jon Smith is activated by Covert-One to find and uncover the truth about Lazarus where all others have failed. As Smith slowly uncovers the deadly underpinnings of the group, he soon learns that the Lazarus Movement is only the very tip of the iceberg in a deadly scheme that threatens billions of lives and will forever change the nature of the world itself.