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James Clapper

WASHINGTON. — A top US intelligence official warned on Thursday that home-grown “violent extremists” continue to pose the most likely threat to US homeland security.

Director of National Intelligence James Clapper told a Senate Armed Services Committee hearing that there is “serious” threat posed by extremist groups’ calling for lone-wolf type of attacks against the United States and other Western countries.

“Of the 13 attacks in the West since last May, 12 were conducted by individual extremists,” said Clapper.

“Lone actors or groups who act autonomously will likely gravitate to simpler plots that don’t require advanced skills, outside training or communication with others,” he added.

Previously, Secretary of Homeland Security Jeh Johnson said Sunday that extremist groups were relying more and more on independent actors to become inspired and attack on their own.

Johnson’s comments came after the Somali-based al-Shabaab militant group released a video calling for attacks on shopping malls in the United States, Canada and Britain.

During Thursday’s hearing, Clapper said more than 3 400 Western fighters had gone to Syria and Iraq, among whom hundreds have returned home to Europe.

About 180 Americans were also involved in various stages of travel to Syria, Clapper said. — Xinhua.