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The Obama administration will announce a new terror alert system in the coming days to better reflect today's threat environment ruled by intermediate-level threats and homegrown attackers, Secretary of Homeland Security Jeh Johnson said Monday.

The U.S operates under a system today called the National Terrorism Advisory System, which is triggered by specific, credible threats to the homeland. Because of that high bar, the system has never been used since 2011 when it replaced the color-coded alert system implemented in the wake of the Sept. 11, 2001 attacks.

"I believe in this environment we need to get beyond that and go to a new system that has an intermediate level to it," Johnson said at a Defense One Live event in Washington.

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