Authorities across the U.S. are cracking down on a surge in mass shooting threats. Meanwhile, on the international front, ISIS is regaining strength in Syria. CBS News national correspondent Jericka Duncan reports on efforts to stop domestic terrorism, and CBS News senior national security analyst Fran Townsend joins CBSN with more on the U.S. response.
How the U.S. is combating domestic and foreign terrorism
Authorities across the U.S. are cracking down on a surge in mass shooting threats. Meanwhile, on the international front, ISIS is regaining strength in Syria. CBS News national correspondent Jericka Duncan reports on efforts to stop domestic terrorism, and CBS News senior national security analyst Fran Townsend joins CBSN with more on the U.S. response.
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