Global Terrorism: Threats to the Homeland, Hearing Before the House Committee on Homeland Security, Testimony of Mr. Russell Travers, Acting Director, National Counterterrorism Center, Office of the Director of National Intelligence [open pdf - 473KB]
From the Testimony: "The US and its allies continue to pursue an aggressive global campaign against a complex array of terrorist actors. Operating across Africa, Asia, and the Middle East, US and partner forces have killed or captured thousands of terrorist leaders and operatives since September 11th, exemplified this past weekend in the heroic removal of the brutal ISIS [Islamic State of Syria and Iraq] in Iraq and Syria leader, Abu Bakr al-Baghdadi. These removals degrade the ability of terrorists to organize, communicate, and strike the US. Working unilaterally or with partner-nations, the US has disrupted numerous attack plots, saving the lives of countless potential victims. At home, federal, state, and local intelligence and law enforcement agencies--working in close cooperation--continue to counter terrorist activity. Enhanced border security efforts have constrained groups' ability to infiltrate the US, and we now assess the most predominant terrorist threat to the Homeland to emanate from US-based lone actors. Additionally, the US government and private sector allies have made significant strides curtailing terrorists' online presence."
Office of the Director of National Intelligence: http://www.dni.gov/