“The threat of a massive cyber attack on civilian infrastructure, leading to loss of life and perhaps billions in damages, has kept lawmakers on edge since before former Defense Secretary Leon Panetta warned of it back in 2012 (or the fourth Die Hard movie in 2007). Many experts believe that a sneak attack would be highly unlikely. But if one were to occur today, DHS and the Defense Department wouldn’t exactly know who is in charge.”
Source: The U.S. Still Doesn’t Know Who’s In Charge if Massive Cyber Attack Strikes Nation – Defense One