WASHINGTON - The secretary of Homeland Security issued a new National Terrorism Advisory System Bulletin Friday amid increased threats identified by the department amid the easing of COVID-19 related restrictions across the United States."The Homeland is facing threats that have evolved significantly and become increasingly complex and volatile in 2021," the bulletin, published Friday, said. "Violent extremists may seek to exploit the easing of COVID-19-related restrictions across the United States to conduct attacks against a broader range of targets after previous public capacity limits reduced opportunities for lethal attacks."According to DHS, threats include those posed by domestic terrorists, individuals and groups engaged in.