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Grassroots Terrorism in 2017: A Small but Stubborn Threat

Jan 19, 2017 | 08:00 GMT

Rescue workers tend to injured bystanders after a truck plowed through a Christmas market in Berlin on Dec. 20, 2016.
(MICHELE TANTUSSI/Getty Images)
Jan 19, 2017 | 08:00 GMT
(MICHELE TANTUSSI/Getty Images)