National Terrorism Advisory System

The National Terrorism Advisory System (NTAS) is a terrorism threat advisory scale used by the US Department of Homeland Security since April 26, 2011.

The NTAS is the replacement for the often-criticized, color-coded Homeland Security Advisory System introduced by the George W. Bush administration in 2002. Janet Napolitano said that the color-coded system often presented "little practical information" to the public and that the NTAS will provide alerts "specific to the threat" with "a specified end date."

On December 16, 2015, Secretary Jeh Johnson activated the bulletin capability for the first time.

The Department of Homeland Security added an intermediate threat level in 2015, after the department identified a "new phase" in the global terrorist threat against the homeland.

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