“Since 9/11, the United States has made important progress in securing our Nation from terrorism. Nevertheless, the terrorist threat facing our country has evolved significantly in the last ten years – and continues to evolve – so that, in some ways, the threat facing us is at its most heightened state since those attacks. This fact requires us to continually adapt our counterterrorism techniques to effectively detect, deter, and prevent terrorist acts.”
Source: Homeland Security Outlines Evolving Terrorist Threats To Congress | Gov Monitor