"Since 2015, the Department of Homeland Security (DHS) has used this Bulletin to highlight the continuing terror threat to the U.S. Homeland. The United States is engaged in a generational fight against terrorists who seek to attack the American people, our country, and our way of life. An informed, vigilant and engaged public remains one of our greatest assets to identify potential terrorists and prevent attacks."
U.S. Department of Homeland Security: http://www.dhs.gov/
National Terrorism Advisory System Bulletin (May 9, 2018)