U.S. to Unveil New Terror-Alert System for Home-Grown Threats

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Secretary of Homeland Security Jeh Johnson speaks at a Defense One 'leadership briefing' in Washington, Monday, Dec. 7, 2015, on the agency's efforts to tackle growing terrorism threats in the U.S. and abroad.

Photographer: Andrew Harnik/AP Photo

The U.S. will modify its warning system to alert citizens and companies about terrorist threats, replacing a two-tiered system with one it says is better suited to modern threats such as the attacks in California last week.

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