NEW YORK - Homeland Security has issued a new National Terrorism Advisory System (NTAS) Bulletin regarding the current heightened threat environment across the United States.In a statement on Friday afternoon, the department says it continues to face a diverse and challenging threat environment leading up to and following the 20th Anniversary of the September 11, 2001 attacks.Al-Qa’ida in the Arabian Peninsula recently released its first English-language copy of Inspire magazine in over four years, which demonstrates that foreign terrorist organizations continue efforts to inspire U.S.-based individuals susceptible to violent extremist influences.Get breaking news alerts in the free FOX5NY News app! | Sign up for FOX 5 email newslettersTh.