Homeland Security Secretary Jeh Johnson Wednesday activated the National Terrorism Advisory System for the first time, warning the public of "self-radicalized actors who could strike with little or no notice."<br />The bulletin, which marks the addition of a new level of public warning, will be in effect for the next six months, Johnson said.<br />The bulletin states that the department "is especially concerned that terrorist-inspired individuals and homegrown violent extremists may be encouraged or inspired to target public events or places."<br />Johnson said there was no specific information about a pending attack.<br />"We are entering a new phase of the current threat," Johnson said.
