The greatest threat facing the U.S. homeland mixes both internal and external enemies, according to the Department of Homeland Security's undersecretary for intelligence and analysis. Homegrown violent extremists influenced by overseas radical ideologues top the list of hazards confronting the public and private sectors in their efforts to secure the country.
Many overseas terrorist organizations still see the United States as the enemy and a roadblock to achieving their objectives. But the threat within now grabs the lion’s share of attention from the Department of Homeland Security (DHS) as well as from intelligence and law enforcement groups that strive to stay a step ahead of terrorists.